 The statement, which claimed that the glaciers in the Himalayas were likely to melt within thirty years, was not based on scientific data.
<clarity>  The statement, which claimed that the glaciers in the Himalayas were likely to melt within thirty years, was not based on scientific data.
 The statement, which claimed that the glaciers in the Himalayas were likely to melt within thirty years, has been found to have not been based on scientific data.