Temperature Rising

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

A Biofuel Debate: Will Cutting Trees Cut Carbon?

Does combating climate change require burning the world’s forests and crops for fuel?

It certainly looks that way, judging from the aggressive mandates governments around the globe have set to incorporate bioenergy into their transportation fuels in the hope of limiting the world’s overwhelming …

Biofuel

Risk of Extreme Weather From Climate Change to Rise Over Next Century, Report Says

WASHINGTON — More people will be exposed to floods, droughts, heat waves and other extreme weather associated with climate change over the next century than previously thought, according to a new report in the British medical journal The Lancet.

The report, published online Monday, analyzes the …

Climate

Methane Leaks May Greatly Exceed Estimates, Report Says

A device commonly used to measure the methane that leaks from industrial sources may greatly underestimate those emissions, said an inventor of the technology that the device relies on.

The claim, published Tuesday in a peer-reviewed scientific journal, suggests that the amount of escaped methane, a …

Methane

Climate Change Is Shrinking Where Bumblebees Range, Researchers Find

Climate change has narrowed the range where bumblebees are found in North America and Europe in recent decades, according to a study published Thursday.

The paper, published in the journal Science, suggests that warming temperatures have caused bumblebee populations to retreat from the southern …

Climate Change

Climate Change Could Harm British Butterflies

Six species of butterflies in Britain will face local extinction by 2050 because of climate change, a new study reports.

“What was surprising to me was that even in the most benign scenario, the drought effects are quite severe,” said Tom Oliver, the lead author of the new study, published in the …

Climate Change

Climate Change Calls for Science, Not Hope

Is the American approach to combating climate change going off the rails?

Last year, President Obama set a goal of reducing carbon emissions by as much as 28 percent from 2005 levels by 2025, only 10 years from now.

Now, environmental experts are suggesting that some parts of the strategy are, at …

Carbon

Pope Francis Aligns Himself With Mainstream Science on Climate

The new papal encyclical on the environment is a ringing call to action, a critique of consumerism and a prophetic warning about the dangers of ignoring what Pope Francis calls “the ecological crisis.”

But amid all his soaring rhetoric, did the pope get the science right?

The short answer from …

Climate

E.P.A. Warns of High Cost of Climate Change

WASHINGTON — In the absence of global action to curb greenhouse gas emissions, the United States by the end of the century may face up to $180 billion in economic losses because of drought and water shortages, according to a report released Monday by the White House and Environmental Protection …

Environmental Movement

A Call to Look Past Sustainable Development

The average citizen of Nepal consumes about 100 kilowatt-hours of electricity in a year. Cambodians make do with 160. Bangladeshis are better off, consuming, on average, 260.

Then there is the fridge in your kitchen. A typical 20-cubic-foot refrigerator — Energy Star-certified, to fit our …

Environmentalism

California Drought Is Worsened by Global Warming, Scientists Say

The severe California drought that has led the state to order cutbacks in water use may not have been set off by climate change, scientists say, but global warming is making the situation worse.

“The drought is made of two components: not enough rain and too much heat,” said Michael Oppenheimer, a …

Global Warming

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 …

Environment

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 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 …