Question

Explain why scientists are concerned about human activities that cause global warming if global warming is caused by the greenhouse effect and the greenhouse effect is a natural part of Earth’s climate.

Answer 1

Humans are increasingly influencing the climate and the earth's temperature by burning fossil fuels, cutting down rainforests and farming livestock. This adds enormous amounts of greenhouse gases to those naturally occurring in the atmosphere, increasing the greenhouse effect and global warming.

Step-by-step explanation:

Humans are increasingly influencing the climate and the earth's temperature by burning fossil fuels, cutting down rainforests and farming livestock. This adds enormous amounts of greenhouse gases to those naturally occurring in the atmosphere, increasing the greenhouse effect and global warming.

Answer 2

Even if global warming is a natural part of Earth's climate, human activities are accelerating it. Global temperatures are expected to rise much faster than they would have naturally, which may result in severe environmental and climate changes across the globe. These predicted impacts of global warming could have severe, negative impacts to humans.

Step-by-step explanation:

Even if global warming is a natural part of Earth’s climate, human activities are accelerating it. Global temperatures are expected to rise much faster than they would have naturally, which may result in severe environmental and climate changes across the globe. These predicted impacts of global warming could have severe, negative impacts to humans.