Why the earths climate change an important issue?

Around the world, climate change is posing potentially catastrophic and long term changes to the environment. The sea levels are rising and the Artic sea ice is melting. More intense Hurricanes are approaching our coasts lines, and more glaciers are retreating from the mountain valleys they once filled. Warmer temperatures are have led to more rainfalls in some areas. This can cause flooding. Higher temperatures cause droughts in some areas of the world, causing a decline in crop productivity, which may lead to food shortage. Heat waves have become common, and more living species are becoming endangered.

What is global warming

What is global warming?

Global warming is the process when the earth heats up, and the temperature rises. This happens when there is an increase in the production of gases like carbon dioxide, water vapour, nitrous oxide, and methane, which are known as green house gases. These green house gases trap heat and light from the sun in the earth’s atmosphere, and this in turn, increases the temperature, and causes global warming .did you know? That since the beginning of the 20^th century, the average temperature of the earth has risen by 0.8 degree Celsius? Global warming hurts people, animals and plants. In fact many cannot take the change, so they die out.

Average Temperature

Despite the enormous variation in climates and regional temperature around the world, scientists use an average temperature from the entire surface of the earth to measure atmospheric changes as a whole. The overall average temperature of the earth has been risen over the past century. The average temperature of the earth today is about 15 degrees, while during the ice Ages of the past, it has gone as low as 11 degree Celsius.

Effects of Continental drift

Currents in the mantle move magma towards the surface. That is the sea floor. Where the sea floor, or oceanic crust expands new crust is continuously formed by magma and marine sediments. Thus oceans like Atlantic have a ridge in the middle. The mid-Atlantic ridge is infact the longest mountain range in the world and moves America away from Europe and Africa by about 2cm. 1inch a year.

Subduction

Diving plates when oceanic and continental crusts crash, the softer and thinner oceanic crust bends downwards in what is called subduction, while the continental crust forms a range like the Andes and the rocky mountains. The subduction movements may cause deep earth quakes. The material of the oceanic crust melts and breaks down in the viscous mantle.