You are just a click away from contributing to sponsor-supported donations for worthy causes, and all at no cost to you! Here are a few of my favorites:
GreaterGood.com There are seven causes you can support -- just click on one and links to the others will appear at the top of the page.
Freekibble.com Be sure to click for both dogs and cats!
care2.com There are eleven causes to support, with a convenient sidebar list in the upper left corner that checks off each cause as you click.
You may not think that one person can make much of a difference, but the more people who click on these sites the more effective these sites can be. Please help!