GEOLOGY

Detailed explanation-1: -Human Activity Is the Cause of Increased Greenhouse Gas Concentrations. Over the last century, burning of fossil fuels like coal and oil has increased the concentration of atmospheric carbon dioxide (CO2). This increase happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2.

Detailed explanation-2: -Fossil fuels – coal, oil and gas – are by far the largest contributor to global climate change, accounting for over 75 per cent of global greenhouse gas emissions and nearly 90 per cent of all carbon dioxide emissions.

Detailed explanation-3: -Most Americans recognize climate change, but some are still unsure about its causes. Tens of thousands of scientists in more than a hundred nations have amassed an overwhelming amount of evidence pointing to a clear conclusion: Humans are the main cause of climate change.

Detailed explanation-4: -Climate change is caused by humans. Scientists have concluded that most of the observed warming is very likely due to the burning of coal, oil, and gas.

Detailed explanation-5: -Though China is responsible for the largest percentage of current emissions, rich industrialized countries are still responsible for more than one third. By comparison, Africa’s current emissions are less than 4 percent of the global total.