Which of the following contributes to global warming?

The rise in greenhouse gas emissions is a significant contributor to global warming. Greenhouse gases, such as carbon dioxide, methane, and nitrous oxide, trap heat in the Earth's atmosphere. As the concentration of these gases increases due to human activities like burning fossil fuels, deforestation, and industrial processes, more heat is retained, leading to a rise in global temperatures.

This process is often referred to as the greenhouse effect, and it is essential to understand how these emissions lead to climate change. The elevated levels of greenhouse gases enhance the natural greenhouse effect, resulting in altered weather patterns, melting ice caps, and rising sea levels, all of which are symptoms of global warming.

Options that suggest an increase in tree cover, reduction of greenhouse gases, or using renewable energy sources focus on mitigating climate change rather than contributing to it. Increased tree cover can help absorb carbon dioxide, and reducing greenhouse gas emissions is crucial for combatting climate change. Using renewable energy sources typically decreases reliance on fossil fuels, thereby minimizing greenhouse gas emissions.