How do scientists know that changing intensity of the sun is not contributing to climate change as much as human activities?
a) The sun has had an unusual number of sunspots since 1980, and is therefore causing the Earth's climate to cool.
b) The sun's luminance has remained relatively the same which accounts for the steady global temperatures we are experiencing.
c) The sun has become dimmer since 1980 while global temperatures are still rising.
d) The sun is getting brighter since 1980, but it doesn't account for the changes in temperature.
