Juergen Freund / The GEO snake expedition team braving the flooded waters to follow the lead of an aboriginal man looking for snakes in their sacred place. Queensland, Australia, February 2008. Model released.

Bryan and Cherry Alexander / Inuit hunters trying to stop lead opening using their harpoons. Northwest Greenland, 1977.

Steven Kazlowski / An Inupiaq whaling crew prepare to paddle their seal skin boat / umiak, in an open lead in the Chukchi Sea, during spring whaling season, off the Arctic coastal village of Point Hope, Alaska, May 2008

Steven Kazlowski / An Inupiaq whaling crew paddle their seal skin boat / umiak, in an open lead in the Chukchi Sea, during spring whaling season, off the Arctic coastal village of Point Hope, Alaska, May 2008

Steven Kazlowski / Cape Thompson and an open lead in the pack ice, blown open by strong winds, indicating thinning sea ice conditions, 26 miles south of Point Hope, Arctic coast of Alaska, March 2008

Flip Nicklin / Narwhal (Monodon monoceros) group in ice break, Baffin Island, Nunavut, Canada

TJ Rich / Young Springer Spaniel, lying down nose buried in leaf litter, on lead. Wiltshire, England, UK. March.

Heather Angel / Gold band lily (Lilium auratum) flower. Yellow nectar guides lead pollinators to nectaries. Pollinators are swallowtail butterflies and hawkmoths. Cultivated in garden, Surrey, England, UK. Native to...

Guy Edwardes / Two lambs in Wensleydale, Yorkshire Dales National Park, North Yorkshire, England, UK, May.. May 2015

Guy Edwardes / Wensleydale, Yorkshire Dales National Park, North Yorkshire, England, UK. May 2014

Guy Edwardes / Steps down from Glastonbury Tor, Somerset Levels, England, UK, March 2012.

Guy Edwardes / Lavender fields, Valensole Plataeu, Provence, France. July 2014

Guy Edwardes / Lavender Harvest, Plateau de Valensole, Provence, France. July 2014

Guy Edwardes / Lavender fields, Valensole Plataeu, Provence, France. July 2014

Guy Edwardes / Lavender fields, Plateau de Valensole, Provence, France. July 2008

Guy Edwardes / Lavender fields, Plateau de Valensole, Provence, France. July 2008

Karine Aigner / African wild dog (Lycaon Pictus) pups wait for the rest of the pack to lead the way. Mana Pools, Zimbabwe.

Ashley Cooper / Landslip on the South West Coast Path at Charmouth. This section of the Jurassic Coast has always been prone to landslips due to the unstable nature of the Jurassic clays and shales, but increased hea...

Ashley Cooper / Walkers silhouhetted on a country lane near Troutbeck, Lake District, England, UK. November 2005

Ashley Cooper / Mountaineer winter climbing in Coire an Sneachda, Cairngorm mountains, Scotland, UK. February 2011

Ashley Cooper / Mountaineer winter climbing in Coire an Sneachda, Cairngorm mountains, Scotland, UK. February 2011

Ashley Cooper / Computer parts discarded on Funafuti atol Tuvalu. March 2007

Ashley Cooper / Rotten sea ice off the north coast of Svalbard, Norway. July 2013

Ashley Cooper / Rotten sea ice off the north coast of Svalbard, Norway July 2013

Ashley Cooper / The Russian research vessel, AkademiK Sergey Vavilov an ice strengthened ship on an expedition cruise to Northern Svalbard, Norway, July 2013

Ashley Cooper / The Russian research vessel, AkademiK Sergey Vavilov an ice strengthened ship on an expedition cruise to Northern Svalbard, Norway, July 2013

Ashley Cooper / Rotten sea ice off the north coast of Svalbard, Norway July 2013

Ashley Cooper / The Russian research vessel, AkademiK Sergey Vavilov an ice strengthened ship on an expedition cruise to Northern Svalbard, Norway, July 2013

Ashley Cooper / The Russian research vessel, AkademiK Sergey Vavilov an ice strengthened ship on an expedition cruise to Northern Svalbard, Norway, July 2013

Ashley Cooper / The Russian research vessel, AkademiK Sergey Vavilov an ice strengthened ship on an expedition cruise to Northern Svalbard, Norway, July 2013

Ashley Cooper / Technicians fitting solar photo voltaic panels to a house roof in Ambleside, Cumbria, UK. August 2011

Ashley Cooper / Technicians fitting solar photo voltaic panels to a house roof in Ambleside, Cumbria, UK. August 2011

Ashley Cooper / Technicians fitting solar photo voltaic panels to a house roof in Ambleside, Cumbria, UK. August 2011

Ashley Cooper / Technicians fitting solar photo voltaic panels to a house roof in Ambleside, Cumbria, UK. August 2011

Ashley Cooper / Technicians fitting solar photo voltaic panels to a house roof in Ambleside, Cumbria, UK. August 2011

Ashley Cooper / Technicians fitting solar photo voltaic panels to a house roof in Ambleside, Cumbria, UK. August 2011

Ashley Cooper / A technician fitting solar photo voltaic panels to a house roof in Ambleside, Cumbria, UK. August 2011

Ashley Cooper / Fitting wiring to a house roof in Ambleside, Cumbria, UK, to support solar photo voltaic panels. August 2011

Ashley Cooper / Red Gum trees are iconic Australian trees that grow along the banks of the Murray River. They rely on a regular flood cycle to survive. The unprecedented drought of the last 15 years has lead to low r...

Neil Aldridge / Hunt master and his hounds lead out England's oldest fox hunt - the Berkeley Hunt - from the town of Thornbury, Gloucestershire, England, UK. 26th December 2014. Winner of the Portfolio Category o...

Jen Guyton / Ayla Kaltenecker, an aspiring young scientist and the daughter of one of the project's lead scientists, Greg Kaltenecker, measures the head length of an endangered white-backed vulture (Gyps africanus...

Rhonda Klevansky / Farmer transporting maize chaff with oxen, Lesotho. August 2017

Alex Hyde / Photographer heating silica gel over camp fire in rainforest to restore its desiccating properties. The high humidity of the rainforest can fog camera lenses and lead to mould growth, so silica gel is...

Juan Carlos Munoz / Pet dog on lead dressed in coat, waiting at road crossing, Kunming, Yunnan, China, Asia, April 2016.

Tony Wu / Sperm whale (Physeter macrocephalus) family resting at the ocean surface. The lead female holds a giant squid (Architeuthis sp.) in her mouth. Ogasawara / Bonin Islands, Japan.

Niall Benvie / Walkers with dogs on lead in Cardrona, Tweed Valley Forestry Commission, Scotland, UK, November.

Kristel Richard / A lead miner leading his Dales pony out of a gallery, at Killhope Museum, near Cowshill, Upper Weardale, County Durham, England, UK, August. Critically endangered horse breed.

Kristel Richard / Two lead miners leading two Dales ponies, in front of the waterwheel, at Killhope Museum, near Cowshill, Upper Weardale, County Durham, North Pennines, England, UK, August 2016. Critically Endangered...

Kristel Richard / A lead miner and his Dales pony, in front of the waterwheel, at Killhope Museum, near Cowshill, Upper Weardale, County Durham, England. Critically Endangered breed.

Kristel Richard / A lead miner leading his Dales pony, at Killhope Museum, near Cowshill, Upper Weardale, County Durham, England, UK, August. Critically endangered horse breed.

Kristel Richard / A lead miner and his Dales pony, at Killhope Museum, near Cowshill, Upper Weardale, County Durham, England, UK, August 2016. Critically endangered breed.

Kristel Richard / A lead miner and his Dales pony, at Killhope Museum, near Cowshill, Upper Weardale, County Durham, England, UK, August 2016. Critically endangered breed.

Tony Wu / Family of Sperm whales (Physeter macrocephalus) resting at the ocean surface, with the lead female holding Architeuthis giant squid in her mouth. Ogasawara, Japan.

Alex Hyde / Leadwort (Minuartia verna) growing on spoil heap next to lead mine. Peak District National Park, Derbyshire, UK. June.

Aflo / Shiba inu on lead in park with autumn leaves on ground.

Aflo / Shiba inu playing with lead park with autumn leaves on ground.

Aflo / Shiba inu in park with autumn leaves on ground.

Aflo / Shiba inu in park with autumn leaves on ground.

Aflo / Shiba inu running in park with autumn leaves on ground.

Aflo / Shiba inu on walk with owners in park with autumn leaves on ground

Aflo / Shiba inu on lead in park with autumn leaves on ground.

Aflo / Shiba inu on walk with owners in park with autumn leaves on ground.

Kirkendall-Spring / Hikers with dog on the Lake Chelan Trail between Prince Creek and Meadow Creek, Lake Chelan Sawtooth Wilderness, Washington, USA, May 2014. Model released.

Nick Upton / Head on view of two adult male Great Bustards (Otis tarda) in flight, with the lead bird calling. Part of reintroduction project of birds from Russia, Salisbury Plain, Wiltshire, UK, September.

Alex Hyde / Magpie Mine, an abandoned lead mine, in morning light. Peak District National Park, Derbyshire, UK. March.

Mark Taylor / Girl walking Yellow Labrador Retriever pup, age 4 months, straining on leash.

Petra Wegner / Kooikerhondje dog, male carrying lead in mouth.

Bryan and Cherry Alexander / Snow covered power lines lead to a gas drilling derrick near Sabetta, South Tambey Gas field, Yamal Peninsula, Siberia, Russia. February 2014.

Alex Hyde / Slime Mould (Trichia decipiens) fruiting bodies on decaying wood next to pencil lead for scale. Peak District National Park, Derbyshire, UK. November.

Robin Chittenden / Dog (Canis lupus familiaris) on lead, Norfolk, England, UK, October.

Jane Burton / Yellow Goldador Retriever puppy with blue daisy-chain collar and lead, against white background

Alex Hyde / Cowslips (Primula veris) growing on abandoned lead mine, Peak District National Park, Derbyshire, UK, May 2013.

Alex Hyde / Mountain Pansy (Viola lutea), a lead tolerant plant flowering at Magpie Mine, a disused lead works. Peak District National Park, Derbyshire, UK, May 2013.

Alex Hyde / Leadwort (Minuartia verna) growing on spoil heap next to lead mine. Peak District National Park, Derbyshire, UK, May.

Alex Hyde / Leadwort (Minuartia verna) growing on spoil heap next to lead mine. Magpie Mine, Peak District National Park, Derbyshire, UK, May.

Chris Mattison / Mountain pansies (Viola lutea) growing on spoil heap near an old lead mine (Magpie Mine) Derbyshire, England, UK, May.

John Cancalosi / Lead (Pb) Ingot

John Cancalosi / Galena (PbS) a lead ore, from Madan, Bulgaria.

John Cancalosi / Galena, PbS, a lead ore, from Madan, Bulgaria.

Graham Eaton / Dog chasing and disturbing a flock of Knots (Calidris canutus) on a beach, Hoylake, Wirral

Terry Whittaker / Grey Squirrel (Sciurus carolinensis) on post next to sign which reads 'Please keep your dog on a lead' Kent, UK. January 2013

Terry Whittaker / Grey Squirrel (Sciurus carolinensis) on post with paw on sign which reads 'Please keep your dog on a lead' Kent, UK. January 2013

Cyril Ruoso / Andrianome Vonjy Nirin, a Malagasy researcher studies impact of Lead Tree (Leucaena leucocephala) on the Ring-tail Lemur (Lemur catta). Plant is suspected of poisoning lemurs, Berenty Private Reserve,...

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) mother and baby showing hair loss (alopecia) due to poisoning from Central American introduced Lead Tree (Leucaena leucocephala) vulnerable, Berenty Private Reserve, Ma...

Mark Hamblin / 2020VISION / Thrift / Sea pink (Armeria maritima) in flower, Pembrokeshire Coast National Park, Wales, UK, May. Did you know? It was once believed Thrift could cure lead poisoning.

Christophe Courteau / Aerial view of Okavango delta game trails (hippos) lead to waterhole Botswana

Todd Mintz / Semipalmated plover (Charadrius semipalmatus) calling to lead predators away from nest, Grise Fiord, Ellesmere Island, Nunavut, Canadian Arctic, March

Steven Kazlowski / Silhouette of Inupiaq subsistence whalers at the edge of an open lead in the pack ice, looking for passing bowhead whales as the mid-day sun follows the horizon. Chukchi Sea, offshore from Barrow, Arc...

Steven Kazlowski / Silhouette of Inupiaq subsistence whalers at the edge of an open lead in the pack ice, looking for passing bowhead whales as the mid-day sun follows the horizon. Chukchi Sea, offshore from Barrow, Arc...

Steven Kazlowski / Inupiaq subsistence whaler stands on jumbled ice at the edge of an open lead in the pack ice to look for passing bowhead whales, during spring whaling season. Chukchi Sea, offshore from Barrow, Arctic...

Steven Kazlowski / Inupiaq subsistence whalers try to catch a bowhead whale (Balaena mysticetus) from their umiak in an open lead in the pack ice. Chukchi Sea, offshore from Barrow, Arctic coast of Alaska, April 2012.

Steven Kazlowski / Inupiaq subsistence whalers prepare to pull up a bowhead whale (Balaena mysticetus) catch along the edge of the open lead in the pack ice. Chukchi Sea, offshore from Barrow, Arctic coast of Alaska, Ap...

Steven Kazlowski / Inupiaq subsistence whalers break open a hole in the pack ice using a harpoon along the edge of an open lead, during spring whaling season, Chukchi Sea, offshore from Barrow, Arctic coast of Alaska

Steven Kazlowski / Inupiaq subsistence whaler stands on jumbled ice at the edge of an open lead in the pack ice to look for passing bowhead whales, during spring whaling season. Chukchi Sea, offshore from Barrow, Arctic...

Steven Kazlowski / Inupiaq subsistence whalers paddle their umiak, or bearded seal skin boat, to find passing bowhead whales traveling through the open lead, during spring whaling season. Chukchi Sea, offshore from Barr...

Steven Kazlowski / Inupiaq subsistence whalers bring their umiak - bearded seal skin boat - back onto the edge of an open lead in the pack ice, during spring whaling season. Chukchi Sea, offshore from Barrow, Arctic coa...