Global warming looms large over humanity. According to the EPA, worldwide greenhouse gas emissions attributed to human activities increased twenty-six per cent from 1990 to 2005. The rise in carbon dioxide concentrations in the atmosphere accounts for approximately eighty percent of this increase. Often debated, the effects of global warming on the planet and the human population are frightening and mostly self-inflicted.
Here are the 5 Top Causes Of Global Warming ;
1. The Greenhouse Effect
Different types of solar and terrestrial radiation are kept in balance to keep the Earth’s average surface temperature constant. Because the frequencies of the radiation are extremely high and the wavelengths are relatively short —Top Causes Of Global Warming not far from the visible region of the electromagnetic spectrum—solar radiation is sometimes referred to as “shortwave” radiation. Terrestrial radiation, on the other hand, is sometimes referred to as “longwave” radiation due to the comparatively low frequencies and lengthy wavelengths—somewhere in the infrared region of the spectrum.
Watts per square metre is commonly used to assess downward-moving solar energy. The “solar constant,” or total solar radiation energy, is equal to around 1,366 watts per square metre per year at the top of the Earth’s atmosphere. Top Causes Of Global Warming. The average yearly surface insolation is 342 watts per square metre after accounting for the fact that only 50% of the planet’s surface is exposed to solar radiation.
Only a small portion of the total solar energy that enters the atmosphere gets absorbed by the Earth’s surface. Approximately 30 units of the incoming solar radiation for every 100 are reflected back to space by the atmosphere, the clouds, or reflecting areas of the Earth’s surface. Top Causes Of Global Warming. The geographical breadth and distribution of reflective structures, such as clouds and ice cover, can change over time, which means that Earth’s global albedo need not remain constant. The atmosphere, clouds, or surface may absorb the 70 solar energy units that are not reflected.
The same 70 units must be radiated back into space by the Earth’s surface and atmosphere in order to maintain thermodynamic equilibrium in the absence of further problems. According to the Stefan-Boltzmann equation, Top Causes Of Global Warming. the amount of this emission of outgoing radiation is correlated with the temperature of the Earth’s surface (and that of the lower layer of the atmosphere that is effectively in touch with the surface).
2. Fossil fuels
We emit CO2 pollution into the environment when we burn fossil fuels like coal and gas to make electricity or drive our automobiles. Australians contribute far more CO2 emissions than the rest of the world. Top Causes Of Global Warming Nearly two times as much CO2 pollution per person as other wealthy countries’ averages, and more than four times as much as the global average.
As 73 per cent of Australia’s power comes from burning coal and 13 per cent from burning gas, the Top Causes Of Global Warming is electricity generation is the largest source of carbon pollution in the country. The remaining 14% is provided by carbon-free renewable energy sources including hydro, solar, and wind.
3. Stratospheric ozone depletion
Negative radiative forcing of the surface has been caused by the stratospheric ozone (O3) decrease since the 1970s. Top Causes Of Global Warming Due to ozone’s ability to absorb solar energy, two separate effects are in a struggle for dominance in this negative forcing. Top Causes Of Global Warming In the first scenario, more solar radiation reaches Earth’s surface as ozone levels in the stratosphere decrease. This increase in insolation would reflect a favourable radiative forcing of the surface in the absence of any other influences.
Ozone depletion does have a second consequence, though, which is connected to its greenhouse gas characteristics. Less ozone is present in the stratosphere, making it less able to absorb longwave radiation released by the Earth’s surface. Top Causes Of Global Warming Radiation reemission downward decreases in direct proportion to the amount of radiation absorbed by ozone. Since the 1970s, this second impact has outweighed the first and has caused a minor cooling of the lower stratosphere by around 0.5 °C (0.9 °F) each decade and a modest negative radiative forcing of the Earth’s surface.
4. Deforestation & Tree-Clearing
As a result of their ability to remove carbon dioxide from the atmosphere and provide oxygen back into it, plants and trees play a significant role in controlling the climate. As carbon sinks, forests and bushland are an important tool for limiting global warming to 1.5°C. However, people across the world destroy enormous swaths of vegetation for farming, the construction of cities and infrastructure, or the sale of forest products like palm oil and lumber. The stored carbon is released back into the atmosphere as CO2 when vegetation is cut down or burned, causing global warming.
Due to the release of carbon dioxide during the deforestation process as well as the decrease in the quantity of carbon dioxide that forests are able to store, deforestation for the purpose of producing wood for building materials, paper, and fuel causes global warming.
5. Agriculture & Farming
Methane is a greenhouse gas that is produced by animals such as sheep and cattle. The quantity of methane created when animals are grazed extensively, like in Australia, is a significant factor in global warming. Another greenhouse gas that is released when some are used by farmers is nitrous oxide. In Australia, agriculture accounts for 16% of our overall emissions of greenhouse gases.
Large amounts of methane and carbon dioxide are released into the atmosphere as a result of industrial farming and livestock. 40% of the methane and 20% of the carbon dioxide emissions globally come from agriculture.