The Biological Effects of Climate Change

By Laura Morgan

Climate Change Poses a Serious Threat to Biodiversity Climate change induces stress on

species Climate change is occurring at a faster

rate than ever before. Current climate change is caused by

anthropogenic factors. Species unable to adapt to changes in

the environment face extinction.

Earth’s Climate HistoryEarth’s climate has varied greatly over time. It experienced great extremes in temperature early in its geological history. Temperatures have remained relatively constant for millions of years.

Anthropogenic Activity Increase Greenhouse Gases Burning fossil

fuels and deforestation contribute significantly to atmospheric CO2 levels, increasing global temperatures.

Atmospheric Carbon Dioxide Levels Since 1900

Atmospheric CO2 Levels Through Time

Two Examples of the Effect of Climate Change on LifePolar Bear The Great Barrier

Reef

Polar Bears: Symbols of Climate Change Polar bears are being threatened by the

decline in sea ice due to rising temperatures.

Polar bears rely on the sea ice for hunting seals.

Polar bears are losing hunting territory due to dwindling ice.

Without enough food, fewer polar bears are breeding and some starve.

Arctic Sea Ice VanishingSeptember 1979 September 2012

The “Not So Great” Barrier Reef

The Great Barrier Reef off the coast of Australia is threatened by global warming.

Coral are experiencing “bleaching” – a process of whitening after expelling a symbiotic algae that feeds the reef and allows it to grow.

Bleaching does not kill the coral, but it does stress the coral, making it vulnerable.

The Effects of Coral “Bleaching”

Normal Coral“Bleached” Coral

Take ActionScientists are uncertain if global warming can be reversed, but it can be slowed. Things you can do to help: Reduce CO2 emissions – drive fuel-efficient cars and

drive less, turn down the AC or heat in your house, and turn lights off during the day.

Consume wisely – buy from local businesses, use less packaging, buy items that can be reused or recycled, buy bamboo products, and support companies that are committed to reducing its carbon footprint.

Get political – contact you representatives and ask them to support policies that would improve carbon emissions.