2. Carbon dioxide is good for the plant life. Plants are literally "breathing" it and producing oxygen. As with everything in nature, this is balanced by the fact that animals breathe oxygen and release...you guessed it, carbon dioxide.
3. Vulcanic eruptions all over the planet release three orders of magnitude more CO2 than all of humanity combined over a period of one year. These eruptions happen in the Earth's oceans, as well, where they are more frequent as there is simply more ocean floor than there is land on the surface.
So, please stop with the disinformation already. Or just reduce the carbon footprint in the most developed countries in the world and leave the developing world to go through the fossil fuel phase that those countries went through.