averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations, contribute to climate change. As a percentage of all anthropogenic greenhouse gas emissions, carbon dioxide (CO2) accounts for 72 percent (see Greenhouse gas), and has increased in concentration in the atmosphere from 315 parts per million (ppm) in 1958 to more than 375 ppm in 2005. Emissions from energy make up more than 61.4 percent of all greenhouse gas emissions. Power generation from traditional coal fuel sources accounts for 18.8 percent of all world greenhouse gas emissions, nearly double that emitted by road transportation. Estimates state that by 2020 the world will be producing around twice as much carbon emissions as it was in 2000. The European Union hopes to sign a law mandating net-zero greenhouse gas emissions in the coming year for all 27 countries in the union. Electricity usage World energy consumption is predicted to increase from in 2003 to in 2030. Coal consumption is predicted to nearly double in that same time. The fastest growth is seen in non-OECD Asian countries, especially China and India, where economic growth drives increased energy use. By implementing low-carbon power options, world electricity demand could continue to grow while maintaining stable carbon emission levels. In the transportation sector there are moves away from fossil fuels and towards electric vehicles, such as mass transit and the electric car. These trends are small, but may eventually add a large demand to the electrical grid. Domestic and industrial heat and hot water have largely been supplied by burning fossil fuels such as fuel oil or natural gas at the consumers' premises. Some countries have begun heat pump rebates to encourage switching to electricity, potentially adding a large demand to the grid. Energy infrastructure Coal-fired power plants are losing market share compared to low carbon power, and any built in the 2020s risk becoming stranded assets or stranded costs, partly because their capacity factors will decline. Investment Investment in low-carbon power sources and technologies is increasing at a rapid rate. Zero-carbon power sources produce about 2% of the world's energy, but account for about 18% of world investment in power generation, attracting $100 billion of investment capital in 2006. See also Carbon capture and storage Carbon sink Climate Change Emissions trading Energy development Energy portal Global warming Greenhouse gases List of renewable energy organizations Renewable energy