Rich Americans spew more carbon pollution at home than poor

Map shows from the sample of ZIP codes the researchers looked at, the highest and lowest polluters.;

The residential carbon footprint for nearby neighborhoods in two cities and their per capita income.;

Map shows average pounds of carbon dioxide equivalent per person for each state.;

Wealthier neighborhoods can claim a greater share of pollution primarily because they have larger homes.

Rich Americans produce nearly 25% more heat-trapping gases than poorer people at home, according to a comprehensive study of U.S. residential carbon footprints.