Poll 1: What is your little contribution against global warming?

This was first poll question I made for my blog visitors, which was running in Oct 2008.
People could select one or more of the following answers:

a) I ride a bike or walk, instead of using my car
b) I take quick showers
c) I plant trees
d) I pay for my carbon footprints

As expected most of my visitors selected a). This is perhaps the most common way to clear your conscience (at least that is what helps me the most). For me only option a) is the answer.