The answer to this would most definitely be number 2 (:
This is true. They were more powerful for a while and then that was fixed.
The human activity most widely viewed as changing the planet is the burning of fossil fuels. ... to melt, threatening water supplies for hundreds of millions of people. ... and phosphorus to the biosphere than would occur naturally. ... compounds that can remain active in the environment for thousands of years .
hope this helps u
