Fossil fuel use is one of the main causes of climate change and the greenhouse effect. Therefore, we must significantly reduce carbon dioxide emissions from activities like heating and transportation. One option would be to switch to renewable energy sources wherever possible, such as solar, hydropower, wind or geothermal systems. Another important step is to reduce our individual energy footprint. For example, driving a car places a particularly high burden on the environment due to the carbon dioxide emissions into the air. Yet, we should keep in mind that there are several ways to lessen the impact and still continue using cars. For instance, by choosing from many new energy-saving models, we can help reduce harmful emissions.