Answer: Burning fossil fuels contributes the most to greenhouse gases (option b).
Step-by-step explanation:
Greenhouse gases are gases in the Earth's atmosphere that trap heat and contribute to the greenhouse effect, leading to global warming and climate change. The main greenhouse gases include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and fluorinated gases.
Burning fossil fuels, such as coal, oil, and natural gas, releases large amounts of carbon dioxide into the atmosphere. When these fossil fuels are burned for electricity generation, transportation, industrial processes, and heating, they release carbon dioxide that would otherwise remain stored underground. Carbon dioxide is a significant greenhouse gas and is primarily responsible for trapping heat in the atmosphere.
The combustion of fossil fuels is a major contributor to anthropogenic (human-caused) climate change. The increased use of fossil fuels in industries, transportation, and energy production has led to a significant rise in carbon dioxide levels in the atmosphere. This increase in greenhouse gas concentration contributes to global warming and climate-related issues, such as rising sea levels, extreme weather events, and shifts in ecosystems.
While other human activities, such as growing food and using mobile phones, may have environmental impacts, they do not contribute as significantly to greenhouse gas emissions as burning fossil fuels.
In summary, burning fossil fuels is the human activity that contributes the most to greenhouse gases. Reducing our dependence on fossil fuels and transitioning to cleaner and renewable energy sources are crucial steps in mitigating climate change and reducing greenhouse gas emissions.