1 00:00:15,190 --> 00:00:12,230 the major driving force of this earth 2 00:00:18,550 --> 00:00:15,200 system would be sang the sound is the 3 00:00:21,109 --> 00:00:18,560 only energy source that we receive 4 00:00:23,189 --> 00:00:21,119 however the sound is relatively constant 5 00:00:25,429 --> 00:00:23,199 through our time what is changing the 6 00:00:28,070 --> 00:00:25,439 most is the earth's surface and the 7 00:00:31,589 --> 00:00:28,080 atmosphere constitutes 8 00:00:33,830 --> 00:00:31,599 clouds is my specialty here and clouds 9 00:00:36,389 --> 00:00:33,840 are actually the heat engine of the 10 00:00:37,990 --> 00:00:36,399 earth's circulation they provide the 11 00:00:40,389 --> 00:00:38,000 heat that drives the whole global 12 00:00:41,190 --> 00:00:40,399 circulation if we send pollution in the 13 00:00:43,430 --> 00:00:41,200 air 14 00:00:44,549 --> 00:00:43,440 that will change the reflectance of the 15 00:00:46,950 --> 00:00:44,559 clouds 16 00:00:49,670 --> 00:00:46,960 which will be brighter and reflect more 17 00:00:51,590 --> 00:00:49,680 of the sunlight back into the space that