Almost half the world’s peo­ple depend on water from the moun­tains. But that vital resource is desta­bi­lized and dis­ap­pear­ing. Cana­di­an sci­en­tist Dr. John Pomeroy reports back from the ​“High Moun­tain Sum­mit” in Gene­va. He reveals secrets of snow and per­mafrost. Then from Queens­land Aus­tralia, Dr. Sean Maxwell explains why intact trop­i­cal forests count for six times more car­bon than we thought. Those dis­tant places may deter­mine how hot, stormy, or flood­ed your future may be.