Final answer:
The increased greenhouse effect and depletion of the ozone layer are examples of climate change caused by human activity.
Step-by-step explanation:
The increased greenhouse effect and the depletion of the ozone layer are two examples of climate change phenomena caused by human activity. The primary cause of these issues is the burning of fossil fuels, which releases greenhouse gases such as carbon dioxide and methane into the atmosphere. These gases trap heat, leading to a rise in global temperatures and other environmental impacts.