anthropogenic (human-induced) changes in the earth system group of answer choices are decreasing as technology leads to more environmentally friendly practices. began as early as 20,000 years ago as humans began to modify ecosystems. are responsible for natural contaminants such as soot, dust, and organic waste. include global warming, which is greatly enhanced by society's production of greenhouse gases. D. began as early as 20,000 years ago as humans began to modify ecosystems.
