Yes. Because of such ways that we burn our garbage and using our cars in which they emit smoke that ca cause the thining of our ozone layer and any harmful activities that may lead to global warming and if we continue to do this kinds of activities the heat from the sun might enter the earth and ozone layer is the one which protects us from the harmful rays of the sun and if there is no ozone layer there is a greater chances that our earth will increase the heat and people will not be able to survive because of the very hot weather.
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Yes,human activities greatly contributed in changing the Earth's climate.
Greenhouse gases,aerosols,and burning of fossil fuels are among the largest known contribution which releases carbon dioxide. :D