3.4 Human Activities and the Natural Greenhouse Effect (p.230 – 241)

Natural Greenhouse Effect The anthropogenic greenhouse effect is a process in which human-produced greenhouse gases in Earth’s atmosphere absorb heat energy from the Sun and Earth’s surface The anthropogenic greenhouse effect is linked to the start of the industrial revolution more than 300 years ago, and the practice of burning carbon-rich fuels like coal.

Methane Gas Methane, one of the most powerful greenhouse gases, is produced in large amounts by cattle when they burp or “pass gas.” We raise cattle for food, and Canada’s cattle produce 72% of our emissions of methane.

Greenhouse Gasses - 4 Types Carbon Dioxide (CO2) Methane(CH4) Nitrous Oxide(NO2) Halocarbons

Canadians With less than 1% of the world’s population, Canada contributes about 2% of the world’s greenhouse gas emissions. How do Canadians contribute to greenhouse gas emissions?

Canadians Produce Greenhouse Gasses

Starting Point Activity Methane is produced naturally in the environment. But it also is produced by human activities such as raising cows for their milk and meat. 1. List 4 human activities that produce greenhouse gases .Share your ideas with a partner and then with the whole class. 2. How can we reduce the amount of greenhouse gasses from human activities?

Starting Point Answers Ex: - driving vehicles (CO2) - burning fuel in wood stoves and furnaces (CO2) - growing food in greenhouses (water vapour, if greenhouse is not properly sealed) - eating meat (methane). 2. Ex: - taking public transit - eating less meat - using solar or wind power instead of fossil fuels.

Now Do This… Greenhouse Gasses use p.233 in your text book to complete the table on your handout Canada’s Role in Greenhouse Gas Emissions Use the words from p.234-235 in your text book to complete the table on your handout (Note: these are in scrambled order)

Homework Complete & Hand in Case Study Investigation: Can Biofuel Solve the Problem of Climate Change? # 1 – 4 must be answered and handed in by Mon. June 17 (will be marked)