Energy from renewable resources—wind, water, the sun, biomass and geothermal energy—is inexhaustible and clean.

The costs of technologies to capture that energy are rapidly falling and becoming economically competitive with fossil fuels, while reducing the risk of climate change. Investing in renewable energy creates jobs, fosters economic growth, and improves energy security for countries that lack domestic fossil fuel resources.

A map showing the wind speeds all over America. Focusing on San Diego, it can be seen that for most of the county wind speeds are not very high.

Samsø is an energy self-sufficient island off the coast of Denmark. See what they are doing to be sustainable.

JOANNA M. FOSTER

Global temperatures have warmed significantly since 1880, the beginning of what scientists call the "modern record." At this time, the coverage provided by weather stations allowed for essentially global temperature data. As greenhouse gas emissions from energy production, industry and vehicles have increased, temperatures have climbed, most notably since the late 1970s. In this animation of temperature data from 1880-2011, reds indicate temperatures higher than the average during a baseline period of 1951-1980, while blues indicate lower temperatures than the baseline average.

A projection for the tourism industry in San Diego for December 2011 onward based on previous economic dat and trends

Number of people per car sold in US 1971-2011

A new geospatial application developed by the U.S. Department of Energy's National Renewable Energy Laboratory (NREL) allows users to easily and accurately map potential renewable energy resources in the United States.

Analia Murias

A report by the United Nations Development Programme (UNDP) indicates that ocean surface water warming limits the upward movement of nutrients and this can cause a decrease in fish production.