(FILES) An aerial view shows the "bathtub ring", a white band of mineral deposits showing previous water levels, of Lake Mead on June 28, 2022 at the Hoover Dam on the Colorado River at the Nevada and Arizona state border. Scientists warn of record heat, threats to climate monitoring. Planetary heating is intensifying and key climate indicators are deteriorating, top scientists said on June 11, 2026, warning that funding decisions affecting Earth observation systems in the United States and other countries threaten efforts to track global warming. (Photo by Patrick T. FALLON / AFP via Getty Images)