This post is by James Wang, Ph.D., a climate scientist at Environmental Defense Fund.

This month, while Arctic sea ice hits its annual wintertime high (such as it is - see last week's post), Antarctic sea ice reaches its summertime low.

We've already posted about the British Antarctic Survey's report of a vast ice berg on the verge of breaking off the Wilkins Ice Shelf. Here's more on what's happening at the South Pole from NASA's recent briefing on polar sea ice.

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This post is by Sheryl Canter, an Online Writer and Editorial Manager at Environmental Defense Fund.

Here's the quote of the week, from a New York Times Op-Ed piece:

Denmark, Finland, Norway and Sweden have had carbon taxes in place since the 1990s, but the tax has not led to large declines in emissions in most of these countries - in the case of Norway, emissions have actually increased by 43 percent per capita.

This observation reinforces what we've been saying all along about why a carbon tax isn't the right approach. A tax doesn't guarantee lower emissions; a cap does.

This post is by James Wang, Ph.D., a climate scientist at Environmental Defense Fund.

Last summer we saw record-shattering shrinkage of Arctic sea ice caused, in part, by human-induced global warming. Last week I listened in on a NASA briefing on polar sea ice, and this year looks no better.

This winter was relatively cold due to a strong La Niña, so the Arctic saw a modest increase in overall sea ice (slightly above the record low of 2005-2006, but still below the long-term average). However, the older, thicker ice that lasts through the summer has declined sharply, and this is very worrying.

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This post is by Ramon Cruz, Senior Policy Analyst for Living Cities at Environmental Defense Fund.

It's ironic. In many parts of the world, there is no clean drinking water. Here in the U.S., pure, drinkable water flows out of every tap, and yet Americans buy a staggering amount of bottled water. We pay big bucks for it, too - over $15 billion a year.

Worse of all, the bottles are overflowing our landfills, and contribute to global warming. Take a look at this video from Doug James, and then check out these surprising facts.

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This post is by Sheryl Canter, an Online Writer and Editorial Manager at Environmental Defense Fund.

A huge Antarctic ice berg - seven times the size of Manhattan - is close to breaking off, supported only by a thin strip of ice hanging between two islands.

Part of the Wilkins Ice Shelf, the berg was captured in satellite and video images by British Antarctic Survey (BAS), which said, "It is another identifiable impact of climate change on the Antarctic environment."

This post is by Lisa Moore, Ph.D., a scientist in the Climate and Air program at Environmental Defense Fund.

According to NOAA's National Climatic Data Center, this past winter was the coolest since 2001. A single season can't determine a long-term trend any more than a single month can (see my previous post, "Did Global Warming Stop in January?"). But the recent cooler temperatures do offer an opportunity to talk about La Niña - a climate pattern that causes short-term cooling.

This winter's La Niña is the strongest (coldest) since 1989, so we'd expect the weather to be cooler than usual. But even so, the cooling didn't come close to offsetting the warming of the past 50-100 years. As you can see in the graph below, the cooling barely takes us back to 2001.

Data source: NASA. Each dot is a three-month period (season).

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This post is by Sheryl Canter, an Online Writer and Editorial Manager at Environmental Defense Fund.

Oil is over $100 a barrel now - an all-time high. Even if burning gasoline weren't a major cause of global warming, a price that high is motivation to conserve.

But we don't seem to be trying very hard.

Here are some numbers that make the point from Earth: The Sequel, the new book by EDF President Fred Krupp and Miriam Horn. (All profits from book sales support our global warming work.)

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This post is by Tony Kreindler, Media Director for the National Climate Campaign at Environmental Defense Fund.

Operation Climate Vote

This post is part of a series on the work of the Environmental Defense Action Fund to enact an effective climate law. You can help by writing to Congress.

We're closer than ever to passing national climate legislation:

• Senator Barbara Boxer (D-CA) predicts a Senate floor vote in June.
• House Energy and Commerce Committee Chairman John Dingell (D-MI) signals he'll circulate a bill in April.
• House Energy and Air Quality Subcommittee Chairman Rick Boucher (D-VA) says there's a 50-50 chance of passing climate legislation this year.

But we need to maintain grassroots pressure to keep legislators focused on the need to pass a bill this year.

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This post is by Tony Kreindler, Media Director for the National Climate Campaign at Environmental Defense Fund. It's the fourth in a series on Why a Bill in 2008:

1. Same Politics in 2009
2. Good versus Perfect
3. The Price of Waiting
4. The World is Waiting
5. Best Answer to High Gas Prices

Why push for a climate bill in 2008? I've already given some important reasons in my previous posts: the politics will be much the same in 2009, we don't want to squander the current momentum, and in any case, we simply can't afford to wait.

But if those aren't reason enough, here's another: The world is waiting for us to act. To solve the global warming problem, China and other developing countries also must cap their emissions, and they won't do this until our own cap is in place.

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This post is by Sheryl Canter, an Online Writer and Editorial Manager at Environmental Defense Fund.

Last week I wrote about the TreeHugger interview with EDF President Fred Krupp and Miriam Horn about their new book. Earth: The Sequel is an engaging look at emerging technology in the fight to stop global warming.

Fred has been getting around quite a bit lately. This week he also was interviewed by Forbes, Newsweek, and Mercury News. Each had a slightly different focus. Here are some excerpts:

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