Spend sometime calculating the new cancers that would result.  The cost and the death that would ensue.  Why do you think they produce sunscreen?  Don't believe any chemicals are good for corals.  But I also believe that coal burning plants, fossil fuels and toxic chemicals are bad for the entire planet especially the corals. Write a bill to have China stop burning coal or to turn the switch off at Fukushima.  Would you let a child go into he burning sun without sunscreen?  I hope not. This bill is to narrowly crafted... I won't be around long enough to find out.  Famine, longer and hotter days, lack of potable water, solar remediation, sequestration of CO2 and methane emissions, environmental refugees, rising water are thing that interest me.  But one has to start someplace.  Imagine if we did not treat our sewage.  Somebody thought that was a good idea many years ago.  And got something done about it.  It's a start.