CAUSES AND EFFECTS OF CLIMATE CHANGE

Date: 24th November 2012Presented by: NARAINO MAJIE

Nabiilah

CONTENTDefinition of Climate ChangeCauses of Climate Change- Natural Causes & Human Causes

Effects of Climate Change

DEFINITION OF CLIMATE CHANGE “ It is a change which is attributed

directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparative time periods”

CAUSES OF CLIMATE CHANGE NATURAL CAUSES

Volcanic eruptions

Ocean currents

Earth orbital changes- More tilt = warmer summers & colder winters

Less tilt = cooler summers & milder winters

Solar Variation

HUMAN CAUSES (Anthropogenic or Man-made causes)

Greenhouse gases Deforestation Coal mining Burning of fossil fuels Industrial processes Agriculture

Deforestation

Coal Mining

Burning of Fossil Fuels

Industrial processes

Agriculture

EFFECTS OF CLIMATE CHANGERISE IN SEA LEVEL

Melting ice sheets Sea level rise

HEAVY RAINFALL ACROSS THE GLOBE

EXTREME DROUGHT

DECLINE IN CROP PRODUCTIVITY

ECOSYSTEMS ARE CHANGING

HURRICANES

RISE IN TEMPERATURE

CARBON DIOXIDE ACIDIFIES SEAWATER

CO2 and carbonate (which plankton use to make shells) combine in the ocean.

The ocean is already more acidic than it was 50 years ago.

Source: Alfred-Wegener-Institute

CO2 CO2

Ocean

Atmosphere

“shelled-critters”

THANK YOU