Global climate is changing as a result of human activity (How do human…
Global climate is changing as a result of human activity
How do human activities produce greenhouse gases
some industries emit large amounts of greenhouse gases such as carbon dioxide and methane.
this occurs during the production process, for example during the production of iron and steel, chemicals and cement
most forms of transport use fossil fuels to power them.
When fossil fuels are burnt gases e.g. carbon dioxide are released, which build up in the atmosphere adding to the enhanced greenhouse effect.
the generation of power accounts for 25% of global carbon dioxide emissions.
The main source is the use of coal and natural gas to produce electricity.
livestock, especially cattle, produce methane as part of their digestion.
This represents almost 1/3 of the emissions from the agriculture sector.
An increase in rice production due to growing populations in Asia has also seen an increase in the production of methane
What are the negative effects that climate change is having on the environment and people?
Changing patterns of crop yield
In Africa, countries such as Tanzania and Mozambique will have longer periods of drought and shorter growing seasons.
They could lose 1/3 of their maize crop.
It is forecast that in India there will be 50% decreased in the amount of land available to grow wheat.
Rising sea levels
research published in 2007 by the
Met Office Hadley Centre for Climate Science and Services in Exeter,
showed that between 1993 and 2006 sea levels rose 3.3 mm a year
This rise will threaten large areas of low-lying coastal land including major world cities such as London, New York and Tokyo
This vast majority of the world's glaciers are retreating (melting), some more quickly than others.
This is thought by some to be due to the increase in temperatures caused by climate change.
The melting of glaciers at the pole could also affect ocean water movement
Its thought that melting ice in the Artic could make the Gulf Stream divert further south.