The Least You Can Do
The only thing that's worse than ignoring a cause is doing something absolutely trivial and patting yourself on the back about it. Apparently if you blog about the environment today, you've done your part. I think there was a day last week when you were supposed to alter your CSS style sheets to decry the slaughter of monks in Burma.
You want to do something for the environment? Don't blog about how much you love pandas: reduce your waste stream. You want to support the troops? Don't put a sticker on your SUV: drive a high-mileage car.