Global Warming And Climate Change

Topics: Greenhouse gas, Climate change, Global warming Pages: 7 (1221 words) Published: March 2, 2015
In the last past years, the Earth has been experiencing increasing temperatures, leading to harmful consequences on our planet and its habitants. This has been researched and analysed, concluding to name such changes as Global climate change. As explained by the US agency, the National Oceanic and Atmospheric Administration (NOAA), there are 7 indicators that would be expected to increase in a warming world, and 3 indicators would be expected to decrease.

Global Climate Change has been recognised as an increase in average global temperatures. Natural events and human activities are believed to be contributing to such temperature increasing changes. This has led to the development of what is now known as Global Warming. Global warming has been proved as the increase of Earth´s average surface temperature due the effect of greenhouse gases.

Greenhouse Effect:

The greenhouse effect is a natural process that warms the Earth’s surface. When the Sun’s energy reaches the Earth’s atmosphere, some of it is reflected back to space and the rest is absorbed and re-radiated by greenhouse gases. Greenhouse gases include:

carbon dioxide
nitrous oxide
and some artificial chemicals such as chlorofluorocarbons (CFCs). The absorbed energy warms the atmosphere and the surface of the Earth. This process maintains the Earth’s temperature at around 33 degrees Celsius warmer than it would otherwise be, allowing life on Earth to exist.

The greenhouse effect is the rise in temperature on Earth as certain gases in the atmosphere trap energy.

Energy from the sun drives the earth’s weather and climate, and heats the earth’s surface. In turn, the earth radiates energy back into space
Some atmospheric gases (water vapour, carbon dioxide, and other gases) trap some of the outgoing energy, retaining heat somewhat like the glass panels of a greenhouse

These gases are therefore known as greenhouse gases.

Predicted levels of Global Climate change:
Greenhouse gas concentrations in the atmosphere will continue to increase unless the billions of tons of annual emissions decrease substantially. Increased concentrations are expected to: Increase Earth's average temperature

Influence the patterns and amounts of precipitation
Reduce ice and snow cover
Raise sea level
Increase the acidity of the oceans

These changes will impact our food supply, water resources, infrastructure, ecosystems, and even our health .

Future climate change:

Future temperatures are expected to change further. Climate models project the following key temperature-related changes, identified as Key Global Projections: Average global temperatures are expected to increase by 2°F to 11.5°F by 2100, depending on the level of future greenhouse gas emissions, and the outcomes from various climate models. By 2100, global average temperature is expected to warm at least twice as much as it has during the last 100 years. Ground-level air temperatures are expected to continue to warm more rapidly over land than oceans

Projected changes in global average temperatures under three emissions scenarios (rows) for three different time periods (columns). Changes in temperatures are relative to 1961-1990 averages. The scenarios come from the IPCC Special Report on Emissions Scenarios: B1 is a low emissions scenario, A1B is a medium-high emissions scenario, and A2 is a high emissions scenario

Causes of Global Climate Change:


Human activities contribute to climate change by causing changes in Earth’s atmosphere in the amounts of greenhouse gases, aerosols (small particles), and cloudiness

The largest known contribution comes from the burning of fossil fuels, which releases carbon dioxide gas to the atmosphere Human activities result in emissions of four principal greenhouse gases: carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and the...

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