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Global warming
- 1. Our Group Deepankar khare - 24/006 Deepak Mohan - 24/013 Mansi Sharma - 24/017 Rahul Tanwar - 24/025 Vishal Arora - 24/040
- 2. Make a Difference Global Warming
- 3. Introduction • Is the world getting warmer? • If so, are the actions of mankind to blame for earth’s temperature increases? • What can/should be done about these issues?
- 4. History of Earth’s Climate • Earth formed ~4.6 billion years ago • Originally very hot • Sun’s energy output only 70% of present • Liquid water present ~4.3 billion years
- 5. The sun sends out energy as heat and light. This energy comes to our earth during the day time. Some of the sun’s rays get ‘trapped’ in the atmosphere. Some of them get reflected back into space. The ones which get through the atmosphere warm the earth up.
- 6. All the time, the earth radiates heat into space, which cools it down. We only really notice this at night, when there is no heating from the sun. Some of the heat going out is trapped by the atmosphere. This is what makes our planet warm enough to live on. But if too much heat is trapped, our planet will warm up and the climate will change.
- 11. What is the atmosphere and why does it trap heat? The atmosphere is the air around the surface of the earth. It is made from a mixture of gases. We need it for animals and plants to survive. Some of the gases act like a blanket, trapping heat. These gases are called ‘greenhouse gases’. This is known as the ‘Natural Greenhouse Effect’. Without it, the earth would be much colder. (the atmosphere is really much thinner than it looks above)
- 12. So why is global warming happening? (the atmosphere is really much thinner than it looks above) Some things that people do are increasing the amounts of the greenhouse gases in the atmosphere, so more heat is trapped. The heating of the earth through human activities is called the ‘Enhanced Greenhouse Effect’ and this is causing the earth to heat up, or global warming. Global warming doesn’t just mean that the earth gets hotter, it means that the whole climate is changing.
- 13. Natural Greenhouse effect More heat is trapped and causes global warming Atmosphere traps some heat Some heat goes out to space Quite a lot of heat is trapped and the earth is warm enough for life. Enhanced Greenhouse effect Heat radiates from the earth Heat radiates from the earth Atmosphere has more greenhouse gases Atmosphere traps more heat Less heat goes out to space
- 14. Which gases in the atmosphere trap heat? The atmosphere is made of 78% Nitrogen and 21% Oxygen. But these gases don’t trap heat and cause global warming or climate change. What % of the atmosphere is left? The gases which trap heat make up less than 1% of the atmosphere! They are called the ‘greenhouse gases’. The main greenhouse gases are: Carbon dioxide Methane Nitrous oxide Ozone Water vapour Halocarbons Human activity increases the amount of these gases in the atmosphere
- 15. How do humans increase carbon dioxide levels in the atmosphere? Burning fossil fuels releases the carbon dioxide stored millions of years ago. Most of the increased carbon dioxide comes from fossil fuels Deforestation releases the carbon stored in trees. Less trees also means less carbon dioxide can be removed from the atmosphere.
- 16. How do humans increase methane levels in the atmosphere? The amount of methane in the atmosphere has increased by two and a half times since the Industrial Revolution. Increased rubbish in landfill Increased livestock farming Increased rice growing Methane is also released when fossil fuels are extracted Methane is produced when bacteria rot organic matter
- 17. Conclusion Global Warming is a serious that it would reduce if people started from now being conscious about what is happening in the world and the consequences of our actions. How to STOP global warming We can not wait for government to find a solution for this problem, each person can bring important help by adopting a responsible lifestyle, starting from daily little things. Reduce, Reuse, Recycle. Buy energy efficient product Drive less Use the “off” switch Plant a tree Avoid pollution Encourage others to conserve
Editor's Notes
- In examining global warming, we will be looking at questions such as Is the world getting warmer? If so, are the actions of mankind to blame for earth’s temperature increases? What can or should be done about global warming? Are the potential resolutions to global warming worth the cost to implement them?
- This is a big picture examination of the earth’s climate The Earth was formed around 4.6 billion years ago And was originally very hot However, the Sun’s energy output was only 70% of what it is presently Liquid water was present on the surface around 4.3 billion years ago
- The temperature of the earth is directly related to the energy input from the Sun. Some of the Sun’s energy is reflected by clouds. Other is reflected by ice. The remainder is absorbed by the earth.
- If amount of solar energy absorbed by the earth is equal to the amount radiated back into space, the earth remains at a constant temperature.
- However, if the amount of solar energy is greater than the amount radiated, then the earth heats up.
- If the amount of solar energy is less than the amount radiated, then the earth cools down.