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By The New York Times | New York Times reporters document the climate debate and examine the evidence for global warming and its consequences.

Preserving a Mistake Made by Our Meddling With Nature

MECCA, Calif. — The area around this town of date palms attracts two kinds of migrants — hundreds of humans who work the land, and millions of birds that stop to rest and gorge at the nearby Salton Sea. The sea is a 110-year-old, increasingly briny, shallow lake that covers 350 square miles but is …

California Drought

Climate Tools Seek to Bend Nature’s Path

UTRECHT, the Netherlands — The solution to global warming, Olaf Schuiling says, lies beneath our feet.

For Dr. Schuiling, a retired geochemist, climate salvation would come in the form of olivine, a green-tinted mineral found in abundance around the world. When exposed to the elements, it slowly …

Climate

A Tricky Transition From Fossil Fuel

COPENHAGEN — Denmark, a tiny country on the northern fringe of Europe, is pursuing the world’s most ambitious policy against climate change. It aims to end the burning of fossil fuels in any form by 2050 — not just in electricity production, as some other countries hope to do, but in transportation …

Energy

A Gulf in Ocean Knowledge

Scientists probably have significantly underestimated how much the world’s oceans have warmed since the 1970s, according to a new study. The finding may force researchers to revise their gauges of some climate change effects, including the rate of sea-level rise.

The study, by Paul J. Durack of …

Southern Hemisphere

Human-Related Climate Change Led to Extreme Heat, Scientists Say

The savage heat waves that struck Australia last year were almost certainly a direct consequence of greenhouse gases released by human activity, researchers said Monday. It is perhaps the most definitive statement climate scientists have made tying a specific weather event to global warming.

Five …

Climate

Sun and Wind Alter Global Landscape, Leaving Utilities Behind

HELIGOLAND, Germany — Of all the developed nations, few have pushed harder than Germany to find a solution to global warming. And towering symbols of that drive are appearing in the middle of the North Sea.

They are wind turbines, standing as far as 60 miles from the mainland, stretching as high as …

Environment

Fixing Climate Change May Add No Costs, Report Says

In decades of public debate about global warming, one assumption has been accepted by virtually all factions: that tackling it would necessarily be costly. But a new report casts doubt on that idea, declaring that the necessary fixes could wind up being effectively free.

A global commission will …

Climate Change

In the Ocean, Clues to Change

A few weeks ago, some 300 miles off the coast of New Zealand, scientists aboard the research vessel Tangaroa gently lowered two funky-looking orange orbs into the sea. Soon they disappeared, plunging of their own accord toward the depths of the Pacific Ocean.

They were prototypes, specialized robots …

Oceans

Greenhouse Gas Emissions Are Growing, and Growing More Dangerous, Draft of U.N. Report Says

Runaway growth in the emission of greenhouse gases is swamping all political efforts to deal with the problem, raising the risk of “severe, pervasive and irreversible impacts” over the coming decades, according to a draft of a major new United Nations report.

Global warming is already cutting grain …

Climate Change

Cities’ Air Problems Only Get Worse With Climate Change

SAN FRANCISCO — The threats from climate change are many: extreme weather, shrinking snowpack, altered ecosystems and rising and more acidic seas, to name a few. Another lesser-known issue may hit especially close to home for city dwellers. In the world’s already smoggy metropolises, pollution is …

Climate

White House Report Presses Economic Case for Carbon Rule

WASHINGTON — Failing to adequately reduce the carbon pollution that contributes to climate change could cost the United States economy $150 billion a year, according to an analysis by the White House Council of Economic Advisers released Tuesday.

The report is part of the White House’s effort to …

Environment

Chinese Plan to Reduce Coal Use Could Allow Increases for Years

HONG KONG — Under pressure to reduce smog and greenhouse gas emissions, the Chinese government is considering a mandatory cap on coal use, the main source of carbon pollution from fossil fuels. But it would be an adjustable ceiling that would allow coal consumption to grow for years, and policy …

Chinese Economy

Corralling Carbon Before It Belches From Stack

ESTEVAN, Saskatchewan — So much soot belched from the old power plant here that Mike Zeleny would personally warn the neighbors.

“If the wind was blowing in a certain direction,” Mr. Zeleny said, “we’d call Mrs. Robinson down the street and tell her not to put out her laundry.”

That coal plant is …

Carbon

Prominent Environmentalist Helped Fund Coal Projects

To environmentalists across Australia, it is a baffling anachronism in an era of climate change: the construction of a 4,000-acre mine in New South Wales that will churn out carbon-laden coal for the next 30 years.

The mine’s groundbreaking, in a state forest this year, inspired a veteran to stand …

Environment

Environmentalists Denounce Repeal of Australia’s Carbon Tax

SYDNEY, Australia — Opposition politicians and environmentalists in Australia reacted with dismay Thursday to the country’s repeal of laws requiring large companies to pay for carbon emissions, saying that it made Australia the first country to reverse progress on fighting climate change.

The Senate …

Environment

A Price Tag on Carbon as a Climate Rescue Plan

KEWAUNEE, Wis. — Bryan T. Pagel, a dairy farmer, watched as a glistening slurry of cow manure disappeared down a culvert. If recycling the waste on his family’s farm would help to save the world, he was happy to go along.

Out back, machinery was breaking down the manure and capturing a byproduct …

Environment

Taking Oil Industry Cue, Environmentalists Drew Emissions Blueprint

WASHINGTON — In November 2010, three combatants gathered in a sleek office here to build a carbon emissions policy that they hoped to sell to the Obama administration.

One was a lawyer who had been wielding the Clean Air Act since his days at the University of California, Berkeley. Another had …

Environment

Picking Lesser of Two Climate Evils

Climate scientists long ago settled among themselves the question of whether human emissions of greenhouse gases are a problem, concluding that we are running some grave risks. But the field still features vigorous debate about how bad global warming will get, how quickly, and how to combat it.

One …

Climate Change

Climate Campaign Can’t Be Deaf to Economic Worries, Obama Warns

WASHINGTON — President Obama acknowledged Wednesday that his efforts to combat climate change — in particular, Environmental Protection Agency regulations to slash carbon pollution from cars and coal-fired power plants — could raise fuel and electricity prices. And he told environmental advocates …

Environment

Bipartisan Report Tallies High Toll on Economy From Global Warming

More than a million homes and businesses along the nation’s coasts could flood repeatedly before ultimately being destroyed. Entire states in the Southeast and the Corn Belt may lose much of their agriculture as farming shifts northward in a warming world. Heat and humidity will probably grow so …

Global Warming

The Coming Climate Crash

THERE is a time for weighing evidence and a time for acting. And if there’s one thing I’ve learned throughout my work in finance, government and conservation, it is to act before problems become too big to manage.

For too many years, we failed to rein in the excesses building up in the nation’s …

Climate Change

NASA Launching Satellite to Track Carbon

On an average day, some 100 million tons of carbon dioxide is liberated from oil and coal by combustion, wafting into the air. The gas traps heat in the atmosphere, resulting in the gradual warming that has alarmed scientists and much of the public.

But only half of the carbon dioxide stays up …

NASA

Creeping Up on Unsuspecting Shores: The Great Lakes, in a Welcome Turnaround

EPHRAIM, Wis. — Like a slowly draining bathtub, this sparkling inlet of Lake Michigan had seen its clear, cool waters recede for years.

Piers that once easily reached the water had gone high and dry. Fishermen did not dare venture into the shallow water looking for smallmouth bass, lest their …

Great Lakes

The Melting Isn’t Glacial

Centuries from now, a large swath of the West Antarctic ice sheet is likely to be gone, its hundreds of trillions of tons of ice melted, causing a four-foot rise in already swollen seas.

Scientists reported last week that the scenario may be inevitable, with new research concluding that some giant …

Climate Change

Florida Finds Itself in the Eye of the Storm on Climate Change

MIAMI BEACH — The sunny-day flooding was happening again. During high tide one recent afternoon, Eliseo Toussaint looked out the window of his Alton Road laundromat and watched bottle-green saltwater seep from the gutters, fill the street and block the entrance to his front door.

“This never used to …

Climate Change

Panel’s Warning on Climate Risk: Worst Is Yet to Come

YOKOHAMA, Japan — Climate change is already having sweeping effects on every continent and throughout the world’s oceans, scientists reported on Monday, and they warned that the problem was likely to grow substantially worse unless greenhouse emissions are brought under control.

The report by the …

Climate

Borrowed Time on Disappearing Land

DAKOPE, Bangladesh — When a powerful storm destroyed her riverside home in 2009, Jahanara Khatun lost more than the modest roof over her head. In the aftermath, her husband died and she became so destitute that she sold her son and daughter into bonded servitude. And she may lose yet more.

Ms. …

Scientists Sound Alarm on Climate

Early in his career, a scientist named Mario J. Molina was pulled into seemingly obscure research about strange chemicals being spewed into the atmosphere. Within a year, he had helped discover a global environmental emergency, work that would ultimately win a Nobel Prize.

Now, at 70, Dr. Molina is …

Climate

White House Announces 7 Regional Climate Hubs

WASHINGTON — On the heels of the Senate’s passage of a long-awaited farm bill, the Obama administration announced the creation of seven regional “climate hubs” on Wednesday to help farmers and rural communities respond to the risks of climate change, including drought, invasive pests, fires and …

Climate