SUNSCREEN in UV

The distinction between "chemical" and "physical" sunscreen is not due to whether sunscreen is made from chemicals, but rather the action of how the ingredient screens you from the sun. "Chemical" ones are so called because the protect you from UV rays via a chemical reaction - absorbing and then converting UV rays into heat - and "physical" ones are called that because they physically reflect or block the UV rays from your skin. This isn't that hard to grasp especially with the wealth of information out there regarding sunscreen ingredients and how they work; it is not merely a marketing tactic. 

"Chemical" sunscreens get a bad rep because of the way the work - the conversion of UV rays into heat can cause skin sensitivity in some people, which is why "physical" sunscreens are touted as a "better" alternative to the "chemical" ones. Also, as you mentioned in your video, certain sunscreen ingredients can cause coral bleaching, and further studies have to be done on whether sunscreen can actually be absorbed into our bloodstream, and further, cause damage to or affect our bodies. Yes, it is true that lumping all chemical sunscreens together as "bad" is unnecessary but the way you explained why they are considered bad shows that you did not do enough research to educate people about the very sunscreens that you're advocating. Also the fact that you didn't explain how sunscreens are rated the way they are rated, one of the most basic and important factors to consider when purchasing sunscreen, shows you did not do enough research, or at least didn't think it was worth educating your audience about. 

Speaking of how sunscreens are rated, you mentioned chemical sunscreens should be further classified into ones that work for UVA and UVB rays, yet you did not mention SPF is only the factor rating for effectiveness against UVB rays while PA is the factor rating for effectiveness against UVA rays.

For a physics channel, i expected a lot more explanation of the physics involved here... but nope. Just a generic video about sunscreens with some fancy cameras.