Question

• · Describe the status of stratospheric ozone in the past 50 years, what happened and why? And what lessons you could gain from the case?
• · Describe the status of lead in the atmosphere in the past 50 years, what happened and why? And what lessons you could gain from the case?
• · List conditions that promote formation of smog.
• · What is the global warming? What are the causes of global warming?
• · What are the main chemicals causing the global warming?
• · List 3 proxy parameters for climate changes

Answer 1

- In the last 50 years our thinking toward ozone has changed, grown up and developed the path for its maintenance in short all we get to know is the importance of ozone , After the ozone hole and depletion of the layer the problems associated with it like direct impact of UV etc are faced by us and till date we have many programs and associations working on it and we have reduced the ozone depleting substances by 98% .

Lesson learnt is that the vigrous activities of humans are vanishing natural resources , natural protection shield and making earth worse day by day.

- In last 50 years due to enhancement in technology and rapid production etc made our air polluted by a substance called lead.

Bad effects on us Once taken into the body, lead distributes throughout the body in the blood and is accumulated in the bones. Depending on the level of exposure, lead can adversely affect the nervous system, kidney function, immune system, reproductive and developmental systems and the cardiovascular system.

But by knowing the harms caused by it various regulations are implemented to control this pollution.

- Condition that promote formation of smog :

1 summer weather

2 sun radiation

3 when secondary air pollutants are present in the system ex ozone, nitrous oxide

- Global warming is the result of an increase in magnitude of the so-called greenhouse effect, a warming of Earth's surface and lower atmosphere caused by the presence of water vapour, carbon dioxide, methane, nitrous oxides, and other greenhouse gases.

Causes of goobal warming :

1 Burning fossil fuels

2 Deforestation

3 Farming

- Main chemicals causing global warming :

1 carbon-dioxide

2 Methane

3 Fluorinated greenhouse gases – such as hydrofluorocarbons, perfluorocarbons, sulphur hexafluoride and nitrogen trifluoride.

4 Nitrous oxide

- proxy parameters of climate change :

1 Tree rings

2 Fossil pollens

3 ocean sediments

4 ice cores

5 coral and historical

3