A key element of the proposed budget President Obama unveiled today is a plan to make renewable energy more profitable. Anchor Lisa Mullins speaks with Mark Hertsgaard who writes about the environment for The Nation and Vanity Fair.

Anchor Lisa Mullins speaks with Daniel Yergin, author of the Pulitzer-prize-winning book: "The Prize: The Epic Quest for Oil, Money, and Power," about President Obama's proposals to change the country's energy priorities. The proposals were sketched out in the president's address to Congress last night.

National security experts increasingly see climate change as a major threat to global stability. Host Lisa Mullins speaks with Sharon Burke, of the Center for a New American Security, about the new security challenges posed by a warming planet, and what Washington is doing to address them.

The World's Lorne Matalon reports that Mexico City is running out of water. Experts say the only solution is to change the water use habits of the area's 20 million residents.

Australia's terrible wildfires and Europe's big snows might be evidence that when it comes to climate change, the future is now. We'll talk with climate scientist and journalist Heidi Cullen of Climate Central, a non-profit science and media organization.

Wildfire in New South Wales

Anchor Marco Werman speaks with Carl Safina of the School of Marine and Atmospheric Sciences at Stonybrook University about the launch of "Google Ocean."

President Obama's moves on climate change policy mark a stark shift from those of former President Bush. The World's Peter Thomson reports on the legacy of Bush's climate policy and the challenges ahead for the new administration.

President Bush has designated three areas in the Pacific Ocean as national marine monuments. It's the largest marine conservation effort in history. Anchor Lisa Mullins finds out more from Roger McManus, vice president for global marine programs at Conservation International.

Rose atoll

With 2009 likely to be a crucial year for international climate change negotiations, there's increased attention on the role agriculture may play in driving up global temperatures. Cows and sheep produce a LOT of methane, and scientists are looking at new ways to cut such "emissions". The BBC's Matt McGrath reports from Dublin.

Terry Fitzpatrick reports from Cape Town on an effort to save threatened South African penguins. One conservation group is building special nesting igloos so more of the penguins will make it to adulthood.