Life on earth requires the carbon cycle. Nature keep the balance of carbon level but maintaining this balance is being destroyed by human activities. There is a great effect on the carbon cycle when it comes to human activities. Significant amount of carbon into the atmosphere is contributed by burning fossil fuels, changing land use, and using limestone to make concrete. Carbon is also moving to the atmosphere when humans are burning trees and eliminating the forests. Due to these activities, there is a significant increase of the amount of carbon dioxide in the atmosphere which led to climate change and global warming.