Final answer:
The activity most likely to increase greenhouse gases in the atmosphere is burning fossil fuels, which releases stored carbon as carbon dioxide and disrupts the natural carbon cycle.
Step-by-step explanation:
The activity that would most likely contribute to an increase in the amount of greenhouse gases in the atmosphere is burning fossil fuels. When we burn fossil fuels such as coal, oil, and natural gas, carbon that has been stored underground for millions of years is released back into the atmosphere in the form of carbon dioxide, a potent greenhouse gas. This process disrupts the natural carbon cycle, leading to an excess amount of carbon dioxide entering the atmosphere. As a result, more heat is trapped by these gases, contributing to global warming or climate change.
Greenhouse gases like carbon dioxide and methane are the primary drivers of climate change, trapping heat in the Earth's atmosphere. Since the pre-industrial era, human activities, especially the burning of fossil fuels for energy, have significantly increased the concentrations of these gases, accelerating the rate of climate change. In contrast, activities such as planting trees, using renewable energy sources, and reducing waste are strategies that can help reduce the amount of greenhouse gases released into the atmosphere.