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Non-ionising radiation can cause harm. Ask welders (burnt eyes). Get a cheap auto-darkening welding helmet, put it on and point a TV remote at it. The levels of IR in the remote are small, but the sensors still activate in the helmet.

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Yes of course. Microwave ovens run at 2.4 GHz, and cell phones typically operate in the 700 to 1400 MHz range, so it's fair to compare microwave ovens to cell phones. The largest difference between the two is power. Power density is key. Why cellphone radiation gets a lot of attention is because the distance is so low compared to other radiation sources. However your body tells you if it's over the limit. Cell phones aren't burning users. For every study that finds a link between exposure to low levels of non-ionizing radiation and cancer in humans there is at least one that finds such a link does not exist.

Comparing the power density in the microwave spectrum of phones to the sun is reasonable. Should there be recommendations that people stay indoors because of the adverse health risks associated from non-ionizing microwave radiation from the sun?

Or taking a sunbath without using sunscreen...

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