Sunlight is about 1000 watts per sq meter. , Is .016 of that is significant? The 1.6 is a guess anyway.
Solar irradience varies by about 0.2 watts from peak to trough, at about 1366 Watts.
And how is it exactly you expect this to be causing climate change? For one, you would have to violate thermodynamics for this to be causing a buildup of heat in the atmosphere.
Also, 1.6 watts is small, but so is climate change to date. About 0.8 °K, while the entire natural greenhouse warms the planet by 33°K.
Second, more solar would cause all layers of the atmosphere to warm. That's not what is happening:
a:
b:
c:
d:
Panel a is lower troposphere, b is mid-troposphere, c is the tropopause, and d is the stratosphere. What do you think we should expect if more radiation is trapped and re-radiated downwards into the troposphere by greenhouse gases? Would all layers warm? Nope. Less radiation escapes to space, so the stratosphere cools.