This past summer's big-budget disaster movie The Day After Tomorrow depicted a near-future in which human-caused global warming dramatically disrupted the earth's climate system, plunging the world into a new ice age. Although the scenario in the film is clearly an unrealistic fantasy, some scientists say that relatively sudden climate change is theoretically possible—but how likely it is depends on whether human activity really causes global warming. Does the evidence suggest that higher amounts of so-called greenhouse gases in the atmosphere due to fossil fuel consumption are, in fact, causing global warming? And if so, what should we do about it? Peter Robinson speaks with Carl Pope and Fred Smith Jr.

Peter Berkowitz is right to condemn abuses in the peer-review process ("Climategate Was an Academic Disaster Waiting to Happen," op-ed, March 13 ), many of which reflect the biases of both articles' referees and journal editors. . . .

During the 2000 presidential campaign, George W. Bush said, "Prosperity will mean little if we leave future generations a world of polluted air, toxic lakes and rivers and vanished forests." So after two years in office, how has President Bush done as the chief steward of our nation's air, water, and land? Is the Bush environmental record the disaster that critics contend? Or has the administration just done a poor job of articulating its vision for new ways of caring for the environment?

The notion of objective truth has been abandoned and the peer review process gives scholars ample opportunity to reward friends and punish enemies. . . .

A century of solar warming has ended; our planet is cooling...

The same day that Al Gore lectured Congress about man-made global warming, NASA made a startling announcement: The sun is hotter and more active than thought...

Mark Steyn discusses the unsustainable habits of the West...

Does solar power “pay,” in the capitalist sense of the word? Almost...