I don’t believe humans are the cause of global warming there are 100x more natural events that release CO2 into the atmosphere. For example when the movie Inconvenient Truth came out.
Al Gore showed a graph of the past years CO2 and the worlds temperature. The earth’s surface is 70.78% ocean covered. The funny thing about the ocean is that a warm ocean releases CO2 and a cold ocean absorbed CO2. If you watch the movie again Al Gore says “They kinda look similar don’t they?” While the earth warmed up so did the ocean causing it to release CO2. Another good example is decomposing leaf’s release CO2. Humans only contribute like 0.08% or something like that to the worlds total carbon emissions
As for waste I do believe we should reuse and recycle because eventual were are we going to start putting junk? Think about it? You can never completely get rid of matter it must go somewhere.