That is a question that can't be adequately or even approximately answered, but a ballpark answer would be: "When the Industrial Revolution started".
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Agricultural activities began impacting the environment around 10,000 years ago, with the advent of practices such as deforestation and soil erosion. Industrialization in the 18th and 19th centuries significantly accelerated pollution levels through the release of harmful chemicals and emissions into the air, water, and soil.
the planet earth is big and has alot of people on it.
The large red planet that starts with J is Jupiter.
People have walked on only one planet and that's our Earth. The only other place they've been is the Moon, which isn't a planet.
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Earth is the only planet that people have ever walked on. The only other body away from Earth that people ever walked on is the Moon, and that has not happened in over 40 years. The nearest planet (Venus) is always more than 100 times farther away than the Moon is. Venus is hot enough to melt spacecraft and cook people, so even if it were possible, we would not send people to land on it. The next nearest planet (Mars) is always more than 140 times farther away than the Moon is.