For my thoughts on marijuana:
In a Wikipedia article, "According to the United Nations Framework Convention on Climate Change (UNFCCC) secretariat, the overwhelming direct cause of deforestation is agriculture. Subsistence farming is responsible for 48% of deforestation; commercial agriculture is responsible for 32% of deforestation; logging is responsible for 14% of deforestation and fuel wood removals make up 5% of deforestation."
As 42% of logging is used for paper, that's 6% of deforestation.
Also, if everyone went vegan then we only need to use 1/3 of the landspace that we need now for agriculture. So if you take 80%, which is the total deforestation that is caused by agriculture, and eliminate 2/3, we can stop 54% of deforestation by all of us going vegan. Then if we take logging for paper and fuel wood, that's another 19% of deforestation that we can stop by legalizing marijuana. According to another article, "[William Randolph] Hearst had lots of reasons to help....Second, he had invested heavily in the timber industry to support his newspaper chain and didn’t want to see the development of hemp paper in competition."
You can read the whole article here: http://www.drugwarrant.com/articles/...juana-illegal/
54 + 11 = 65% of deforestation that we could stop if we all went vegan and legalized marijuana and used the hemp plant and recycled materials as our sources for paper. 65% is almost 2/3. Now I in no way advocate that we all throw a party and get high all of the time just because it's legal, as it usually loses it's novelty value very quickly in places that have legalized or decriminalized it very quickly anyway. However, besides ecological benefits, legalizing it can also free up 1/4 of the spending on prisons in the US, which goes towards incarcerating people charged with marijuana offenses, it would severely cripple the drug trade for harder drugs putting an end to a large portion of gang violence, it would create agricultural jobs, it can have an excise tax on it to both raise revenue and discourage a heavy stoner lifestyle, it's far more environmentally friendly to make paper out of hemp than it is out of timber, and I've also heard rumors that a completely renewable fuel source to power our cars, trains, and airplanes can be developed from it.
There. Several problems solved at once.