How can human activities affect the earth's system?

Answer 1

Another contributor wrote:

Humans are polluting the environment and causing damage to natural ecosystems by things such as deforestation and air pollution. Human activities are mainly disrupting natural cycles such as the carbon cycle. Humans are emitting extra extra carbon dioxide into the air and cutting down trees that absorb carbon dioxide and emit oxygen. So basically the earth had a stable biosphere right up until the industrial revolution. That's when people started using more machines. The environment has a very delicate balance, after the industrial revolution people started using more resources, producing more waste, damaging the air and water and overall disrupting the balance of the environment. Though unfortunately this wasn't realized until recent times. Scientists are working on ways to help protect the environment but they still have a long way to go. And also a lot of big companies and powerful people don't want to use a lot of today's alternatives because they are worried about loss of money and power.