Question

Positive evidence that CFCs are in the stratosphere comes from ____________.

1) Satellite observations
2) Ground-based measurements
3) Laboratory experiments
4) Computer simulations

Answer 1

Satellite observations provide positive evidence of CFCs in the stratosphere.

Step-by-step explanation:

A positive evidence of CFCs being present in the stratosphere comes from satellite observations. Satellites can observe the concentration and distribution of CFCs in the Earth's atmosphere from space. By analyzing satellite data, scientists can confirm the presence of CFCs in the stratosphere.