Energy Consumption and CO2: Analyzing Trends Activity Source: Earth Science Information Partners Grade Levels: 6-12 Background Human beings rely on energy. We heat and cool our homes, move ourselves from place to place, transport supplies overseas, land, and through air, and produce the things we need to live and work around the world. The sources of energy we use (e.g. fossil fuels, renewables, nuclear) play a key role in how CO2 emissions change over time. [Read More]