Former Vice President Al Gore ’69, left, speaks at at a panel on climate change yesterday afternoon in Sanders Theatre as Butler Professor of Environmental Studies Michael B. McElroy looks on.

Former Vice President Al Gore ’69 called the threat of global warming an impending “crisis” and derided the Bush administration’s polices on climate change as part of a star-studded panel that packed 1,200 into Sanders Theatre last night.

The panel also featured University President Lawrence H. Summers and Butler Professor of Environment Studies Michael B. McElroy in a multi-disciplinary approach to climate change.

During his time in Washington, Gore made a name for himself mastering the details of environmental issues and policies.

“Worldwide temperatures have been going up steadily, and sea levels have been rising as well,” Gore said at yesterday’s panel, backed by a PowerPoint presentation. “This is extremely serious.”

The former vice president zipped through a succession of slides reviewing the threat of climate change and outlined several possible solutions. In one nightmare scenario, sea level would rise more than 18 feet, submerging large swaths of Florida, New Orleans and Manhattan.

And when Gore showed pictures of the disappearing Larsen ice shelf in Antarctica, there were a few gasps and whistles from the audience.

“Are we serious about stopping this kind of thing or is it only the terrorists we’re worried about?” Gore said.

This panel on the environment was something of a homecoming for Gore, who first became interested in environmental issues as an undergraduate at Harvard, while studying with professor Roger Revelle.

He criticized the Bush administration’s inaction in the face of global warming, and even dipped into his bag of jokes to taunt the man who beat him out for the presidency in 2000.

He recalled a time in the sixth grade when a classmate pointed to the east coast of South America and the west coast of Africa and asked if they had ever fit together. The teacher said that was not the case.

“The student went on to become a drug addict,” he joked. “And the teacher went on to become a scientist in the Bush administration.”

The panel discussion, titled “Climate Change: The Way Forward” and moderated by Daniel P. Schrag, director of the Harvard University Center for the Environment, comes only weeks after Russia ratified the Kyoto Protocol and a month after the release of a significant scientific report warning about the effects of global warming on the Arctic.

In his remarks on the subject, McElroy, a leading scientist in the study of climate change, said that the Kyoto Protocol was an ineffective solution to the threat of global warming. He said that even the countries who agreed to the treaty have not been able to meet the reduced levels of greenhouse emissions. “Despite the rhetoric, we’re not doing a very good job in Europe or in other countries to meet the challenge,” he said.

The third panelist was Summers, who as chief economist of the World Bank signed his name to an infamous memo encouraging developed countries to export polluting industries to the third world. But more than a decade later, the University president was steadfast in calling for a solution to the problem of greenhouse gas emissions.

He pointed out that the College had established the Harvard Green Fund, which lends money at zero interest to any school interested in improving its energy efficiency.