Actually they are indications of pure air but also lichen on a tree indicates that the tree may be in declining health. Lichen is a combination of algae and fungus and grows very very slowly. Moss is an indication that there needs to be some better air circulation on that tree. Consider a good pruning in early spring.aving lichens and moss on your tree is an indication that the air around your tree is healthy and clean. They do not harm the tree. They have synergistic relationships with the biosphere of the tree that are more interesting if you leave them there.
Officials said Nevadaâs Lake Mead, the 79-year-old reservoir created by the massive Hoover Dam, registered 1,074.98 feet (327.7 meters) above sea level late on Tuesday, but was able to rise above a critical mark by early on Wednesday morning.
The before images were taken when the lake level was 1,111 feet above sea level. Lake Mead hasnât been officially fullâ1,221 feet above sea levelâsince 1983. The massive intake towers on the Hoover Dam in Lake Mead straddle the Nevada/Arizona border, in this 2007/2014 before-and-after. Should the current drought continue, the Hoover Dam could lose the ability to generate electricity. Image: Ethan Miller/Getty Images. Thanks to an ongoing mega-drought, Lake Meadâs water level will continue to fall for the indefinite future.