Definition of global warming

Although scientists are not absolutely certain what causes global warming, it is thought that the burning of fossil fuels and deforestation plays a large role. These activities have caused the concentrations of heat-trapping "greenhouse gases" to increase in the atmosphere-preventing heat from escaping much like the glass panels of a greenhouse.
While warm summer weather throughout the year may sound appealing to those who live in colder climates, global warming has serious consequences for the planet as a whole. It is thought that global warming is causing the melting of polar ice caps and glaciers. For example, Andean glaciers are melting so rapidly that water and food supplies in Colombia, Argentina, Bolivia, Peru, Chile, Venezuela, and Ecuador are expected to be at risk within 15 to 25 years. Species extinction, extreme weather events, and increases in the range of disease vectors are also thought to be potential consequences for global warming.
Although it's likely too late to repair the damage already caused by global warming, it is believed that developing an aggressive plan of action can help reduce its negative impact. In the United States, governmental agencies have developed initiatives to slow the growth of emissions, strengthen scientific research into the issue, and promote international cooperation when implementing new climate change policies. There is also a widespread campaign to help inform individuals of the steps they can take to reduce personal contributions to greenhouse gas emissions.