Want to help save the planet? So does Action For Nature, an international environmental organization that’s based in San Francisco. The plucky nonprofit group is encouraging kids to take practical steps to protect the environment by awarding cash prizes of up to $500 to young eco-heroes from around the world. Youngsters, ages 8 to 16, who have participated in projects that promote environmental advocacy, health, research, or protection are eligible to apply for the prizes. But don’t dawdle: the deadline for applications is February 28, 2010.