a) What is global warming? How is it different from greenhouse effect? What are  the environmental outcomes of global warming? 

 b) Describe the mechanism of ozone formation in the lower troposphere?

A)

Global warming refers to the long-term increase in the Earth's average surface temperature due to the buildup of greenhouse gases, primarily carbon dioxide and methane, in the atmosphere. The greenhouse effect occurs when these gases trap heat from the sun, preventing it from escaping back into space and causing the planet to warm.

The primary cause of global warming is human activity, particularly the burning of fossil fuels such as coal, oil, and gas, which releases large amounts of carbon dioxide and other greenhouse gases into the atmosphere. Deforestation and other land use changes also contribute to global warming by reducing the amount of carbon dioxide that can be absorbed by trees and other vegetation.

The consequences of global warming include rising sea levels, more frequent and severe heatwaves, droughts, and extreme weather events such as hurricanes, floods, and wildfires. These changes can have significant impacts on human health, food security, and the natural environment, and require urgent action to reduce greenhouse gas emissions and transition to cleaner forms of energy.

Efforts to address global warming involve a range of strategies, including reducing carbon emissions through the use of renewable energy sources such as wind and solar power, increasing energy efficiency, and promoting sustainable land use practices. International agreements such as the Paris Agreement aim to coordinate global efforts to limit global warming to well below 2 degrees Celsius above pre-industrial levels and pursue efforts to limit the temperature increase to 1.5 degrees Celsius.

Global warming and the greenhouse effect are related concepts, but they are not the same thing. The greenhouse effect is a natural process that occurs in the Earth's atmosphere, whereas global warming is the result of human activity that has intensified the greenhouse effect and caused the Earth's temperature to rise.

The greenhouse effect occurs because certain gases in the atmosphere, such as carbon dioxide, water vapor, methane, and nitrous oxide, are able to trap heat from the sun. This trapped heat keeps the _______ ______ ____ ____ ___ ______ ____ ___ _____ _______.
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