Climate Change : Climate Change Norma Garcia
Sec. M - 411 Climate Change : Climate Change Climate change is a change in the statistical distribution of weather over periods of time that range from decades to millions of years. It can be a change in the average weather or a change in the distribution of weather events around an average (for example, greater or fewer extreme weather events). Climate change may be limited to a specific region, or may occur across the whole Earth.
In recent usage, especially in the context of environmental policy, climate change usually refers to changes in modern climate (see global warming). For information on temperature measurements over various periods, and the data sources available, see temperature record. For attribution of climate change over the past century, see attribution of recent climate change. Causes : Causes Factors that can shape climate are often called climate forcings. These include such processes as variations in solar radiation, deviations in the Earth's orbit, mountain-building and continental drift, and changes in greenhouse gas concentrations. There are a variety of climate change feedbacks that can either amplify or diminish the initial forcing. Some parts of the climate system, such as the oceans and ice caps, respond slowly in reaction to climate forcing because of their large mass. Therefore, the climate system can take centuries or longer to fully respond to new external forcings. Greenhouse Gases : Greenhouse Gases Greenhouse gases are gases in an atmosphere that absorb and emit radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The main greenhouse gases in the Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone. In our solar system, the atmospheres of Venus, Mars and Titan also contain gases that cause greenhouse effects. Greenhouse gases greatly affect the temperature of the Earth; without them, Earth's surface would be on average about 33°C (59°F) colder than at present.
Human activities since the start of the industrial era around 1750 have increased the levels of greenhouse gases in the atmosphere. The 2007 assessment report compiled by the IPCC noted that "changes in atmospheric concentrations of greenhouse gases and aerosols, land cover and solar radiation alter the energy balance of the climate system", and concluded that "increases in anthropogenic greenhouse gas concentrations is very likely to have caused most of the increases in global average temperatures since the mid-20th century". Energy: Fossil Fuels : Every day we burn large amounts of gasoline, oil, coal and natural gas. These important sources of energy power our cars, run our businesses and provide electricity. But burning these fossil fuels also produces harmful greenhouse gas emissions.
Like the glass in a greenhouse, these gases collect in the atmosphere and create a barrier that prevents the earth’s excess heat from escaping. As the barrier grows, the earth’s temperature increases. This is magnifying the natural greenhouse effect and the result is climate change.
We now consume petroleum products at a tremendous rate. Burning fuel in our cars, factories and power plants has pumped billions of tonnes of microscopic particles and greenhouse gases into our atmosphere, fundamentally changing its composition. Switching from fossil fuels to clean, renewable energy sources is vital to protect our atmosphere and climate. Energy: Fossil Fuels In my opinion : In my opinion To reduce the greenhouse gases.
The big powers of the world must been aware of this since they are those who more produce greenhouse gases.