Anchor Marco Werman speaks with Richard Manning, an environmental and agricultural journalist, about yesterday's steep increase in the price of rice, a global staple.

The World's Gerry Hadden reports that the European Union today warned that rising global temperatures could create waves of what it calls "climate refugees."

The World's Julia Kumari Drapkin reports that supplies of hops and malted barley are running short of global demand. Which is bad news for the price of beer.

The monarch butterflies of central Mexico are beginning their annual northern migration. But this year, there may be a decline in the number making the trip. Anchor Marco Werman speaks with butterfly expert Lincoln Brower, who says new satellite photos reveal there's been illegal clear-cutting in the forested areas where many butterflies spent the winter last year.

Anchor Lisa Mullins speaks to one who isn't skeptical at all about climate change. Lester Brown is president of the Earth Policy Institute and the author of "Plan B 3.0: Mobilizing to Save Civilization."

The World's Jason Margolis reports on a group of people we haven't heard from in a while: global warming skeptics. They believe climate change isn't real and that governments shouldn't regulate greenhouse gasses.

Online extra interview -- Why the public perceives the science on climate change differently:

Wine producers say global warming could spell disaster for the future of wine. The say rising temperatures could have a negative impact on their grapes, perhaps causing the subtle distinctions among wines to disappear. The World's Gerry Hadden has more from Spain.

The World's Gerry Hadden reports that Spain is struggling to cope with a severe drought. The problem has led to water shortages, and in the Mediterranean port city of Barcelona, to a plan to bring in drinking water via tanker ships.

Anchor Lisa Mullins speaks with The World's Mary-Kay Magistad in Beijing about China's water problems. Officials have redirected water from several Chinese provinces to the capital, Beijing, to prepare for this summer's Olympics. But at least one province is now demanding compensation.

Anchor Lisa Mullins speaks with food industry expert Michael Pollan about the worry over world wheat supplies. The price of wheat has soared to record highs recently. Meanwhile the World Food Program of the United Nations is warning that expensive wheat could soon force the agency to cut back on aid to the hungry around the globe.