9/24/13

Objective: How are humans impacting the environment?

Do Now: What is thispicture depicting?

What is the function of this greenhouse?

Sunlight passes through the glass, where the interior absorbs the radiant energy changing it to heat, the glass stops the heat from escaping

The Greenhouse Effect

The Greenhouse Effect

• Greenhouse gases (CO2, N2, methane, water vapor) trap infrared heat and keep the Earth warm

Global Warming

Carbon dioxide from the burning of fossil fuels adds too many greenhouse gases, resulting in increases in the Earth’s temperature

What is this graph showing?

Global Warming

Global Warming

• Increased probability and intensity of droughts and heat waves

Global Warming

• Melting of the polar ice caps can raise sea levels– Puts more freshwater into the ocean

– Can cause endangerment of animals

The Ozone Layer• The ozone layer: a layer of gases that absorbs

radiation from the sun

Ozone Depletion• The ozone gets depleted (gets holes in it) when

cleaners, air conditioners and refrigerators are used and release chemicals called chlorofluorocarbons (CFCs) into the atmosphere.

So What?

- Without ozone, more UV rays hit earth

- Holes in the ozone can lead to higher rates of skin cancer.

Endangered

• Endangered animals are still living today but are in immediate danger of extinction.

Threatened

• A species that is likely to become endangered if it is not protected.

Conservation

Captive Breeding Programs

Preserving Genetic Material

Zoos, Aquariums, Parks, Gardens

Impact on Water Cycle

• Pollutants such as fertilizers, , pesticides, oil, sewage

• Acid rain from sulfur dioxide reacting with water

Impact on Carbon Cycle

• Burning of fossil fuels (oil, gas, coal)

• Deforestation