If you can’t install a renewable energy system yourself, you can purchase renewable energy certificates from companies such as 3 Phases, which will send you information quantifying your impact and a sticker reading “Powered by Renewable Energy” to encourage others. Your contribution will be used to purchase wind, solar, or other renewable energy to reduce future emissions.

An all-natural option is a properly placed tree, which can reduce heating costs by shielding wind and can reduce air conditioning costs by up to 50%. See arborday.org for a guide to where to install trees.