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This is despite the important statement made by Tom Clough of Holcim during an interview , in which he said : " There are certain requirements for us under the rules and the philosophy of ( South Africa ) , and they have an impact on our mining licences , etc. He said : " There are many , many important issues other than the one the U.S. government is using as the basis of its withdrawal - - or downgrading its status - - from the conference . " With an apparent reference to the desegregation demonstrations of the 1960s , he said : " There 's one group of people who get bullied all the time , and that 's Christians . Here 's what he said : " There is some unproven concern that exposure to ultraviolet light may contribute to cataract formation and / or macular degeneration .