So here’s the deal. Two hundred years ago, carbon dioxide in the atmosphere was at its highest historical levels. Today, it’s 35 percent higher. If I put an extra layer of transparent insulation on my greenhouse, is it going to get cooler in there? Probably not.

However, this is what John Carlson’s recent commentary column seems to be saying. In fact, he seems to be mistaken about a number of things.

To begin with, an average rise in worldwide temperatures means all sorts of crazy weather, not just hotter days. Too much fresh water from melting polar ice, for example, could interfere with the warm Atlantic currents and cause deep-freeze winters on the East Coast. That would get somebody’s attention in Washington.

When Carlson claims there is no warming trend, he’s probably referring to a recent article in Nature that predicts short-term cooling over the next 10-15 years. The article does not deny, however, that the long-term warming observed over the last 100 years will continue.

Carlson also says the International Panel on Climate Change (IPCC) model is wrong. This is hard to understand, since IPCC predictions are a combination of several models, and allow for a great deal of short-term variation. To say their calculations are wrong is to confuse weather change (short term) with climate change (long term).

Worried about all of this? Don’t know what to do? Then you’d probably prefer scientific facts rather than uninformed opinions.

Search on “IPCC AR4 synthesis report” to find out what the IPCC really says. Read what other climate scientists think at realclimate.org.

And then decide for yourself.

J. Patrick Kelley, an environmental science writer, is Communications Chair of the East Lake Washington Audubon Society.

COMMENTING RULES: We encourage an open exchange of ideas in the PNWLocalNews.com community, but we ask you to follow our guidelines for respecting community standards. In a nutshell, don't say anything you wouldn't want your mother to read. So keep your comments:

• Civil
• Smart
• On-topic
• Free of profanity

We ask that all participants own their words by registering for an account. It's a simple process that will take seconds and helps keep our comments free of trolls, cranks, and drive-by commenters.

As a community site, we ask that the community help by using the "Flag" button on each comment if they feel the comment has violated the rules. You can also use the up and down arrows on each comment to voice your opinion about that particular comment.

Want to tell us something but you don't want it to be public? Talk to us privately.