EWG's 2015 Sunscreen Report is online.
There is no clear consensus on whether sunscreens actually prevent cancer; in fact, there’s some evidence that sunscreens might increase the risk of the deadliest form of skin cancer in some people.
The U.S. lags far behind Europe, Japan and Australia in providing consumers with safe, high quality sunscreens. Why you might ask? Because the FDA is slow in evaluating and approving better sunscreen ingredients and new combinations – making it impossible for U.S. formulators to achieve the highest level of UVA protection in their products (Osterwalder, 2009).