GENERAL KNOWLEDGE

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: -Human activities are functions, tasks, or works done by human beings over time for achieving certain purposes. In total there are five types of human activities namely primary human activities, secondary human activities, tertiary human activities, quaternary human activities, and quinary human activities.

Detailed explanation-3: -Worldwide emissions of carbon dioxide (CO2) from burning fossil fuels total about 34 billion tonnes (Gt) per year. About 45% of this is from coal, about 35% from oil and about 20% from gas.

Detailed explanation-4: -Previously, the value was 280 ppm during the 10, 000 years up to the mid-18th century. Each part per million of CO 2 in the atmosphere represents approximately 2.13 gigatonnes of carbon, or 7.82 gigatonnes of CO 2.