For what it is worth here is the opinion of one "gringo".
First we must acknowledge that the actions of one person will have almost no effect on global warming, and that any effect would be minuscule. However if each person on earth would do just one or two things each day then the effects would be prodigious. Even one nation can not reverse global warming and it will take all nations working together to stop it, especially the largest polluters, The United States, China, India, and Japan, and Brasil.
The most immportant things that WE
can do is to lead by example in our daily lives and demand that our political leaders do the same. For example:
1. Walk to the bakery to get our rolls (pao zinho) for breakfast
2. Ride a bicycle to work or school.
3. Unplug all electrical devises when not in use.
4. Plant a tree especially in a city.
5. Recycle our trash and garbage.
6. Use a home water filter and refill your bottled water containers (you get the same quality at a fraction of the cost and save oil which is what plastic is made from).
7. I know that this one will go against the customs of Brasil especially Paulistas and will really hurt some feelings, but I am compelled to say it.
Our names are not Senna, or Fittipaldi and if we would all drive a little slower, and not accelerate and brake so rapidly it would really help.
Thanks for reading my verbose correspondence.