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affecting hundreds of companies in countries around the world. president biden today saying he's directed the full resources of the federal government to investigate, and if russia is responsible, the u.s. will respond. now to northern italy and the melting glacier scientists are trying desperately to save. they're adding hundreds of thousands of feet of protective covering to block the sun's heat and tonight the warning from experts about climate change to the rest of the world. here's abc's julia macfarlane. >> reporter: summer in the italian alps and a desperate race against time. in a bid to delay the snow melting, climate experts in northern italy are now shielding the endangered presena glacier with massive sheets of cloth and covering some 120,000 square meters. authorities say around 70% of the snow can be saved over the aimeat rleinthe sun's tive cover rays. >>he bt weanis to extend the lifetime of these glaciers by some years but really not much more than that. >> reporter: in the alps climate