Biogas, a Low-Tech Fuel With a Big Payoff

Generating Power From Tidal Lagoons

By BETH GARDINER

Supporters of a proposed facility in Wales say that sea-based arrays could provide as much as 10 percent of Britain’s power within a decade.

Trying to Raise Profile of Climate Change for Washington Voters

By KIRK JOHNSON

The effort, by Thomas F. Steyer, has turned the battle over the State Senate into one of the most expensive legislative elections in state history.

A Conversation With Naomi Oreskes

A Chronicler of Warnings Denied

By CLAUDIA DREIFUS

A historian of science imagines what future generations will make of our current handling of climate change.

Race Tests Democrats’ Viability in West Virginia

By TRIP GABRIEL

Representative Nick J. Rahall II has defiantly held on to his seat in a district that faults White House policy for the area’s declining coal industry.

• First Draft: Coal Country Candidates Agree: The E.P.A. Is the Enemy

Rick Piltz Dies at 71; Quit Bush White House Over Climate Policy

By DOUGLAS MARTIN

Mr. Piltz, a climate policy analyst, resigned from the administration of George W. Bush in 2005, accusing it of distorting scientific findings for political reasons and then releasing internal White House documents to support his contention.

For E.U. Climate Meeting, Deep Divisions and High Stakes

By JAMES KANTER

Curbing emissions has long been a popular cause in the European Union. But leaders have to agree on how to generate and distribute energy.

In Tennessee, Time Comes for a Nuclear Plant Four Decades in the Making

By MATTHEW L. WALD

Electricity demand has not met projections, but the cost of upgrading coal-burning plants makes this an opportune moment for the reactor to arrive.

Pentagon Signals Security Risks of Climate Change

By CORAL DAVENPORT

The Pentagon on Monday released a report asserting that climate change poses an immediate threat to national security, with increased risks from terrorism, infectious disease, global poverty and food shortages.

A Gulf in Ocean Knowledge

By HENRY FOUNTAIN

Scientists have probably underestimated warming since the 1970s, a study says. That could affect some climate change measures.

Coordinates

Wild and Craggy, Just Like Thoreau

By JOHN MARKOFF

A group of writers recently made the trek to the summit of an unnamed mountain for a minor act of civil disobedience: a ceremony to name it for Thoreau.