>The rainforests that were there before certainly produce methane
Conditions on the forest floor typically facilitate aerobic decomposition which does not release methane. [1]
>If you want to lock up carbon, you need to take it from the plants and sequester it somewhere natural forces (rot, weathering) won’t break it back down again - like a house, or in a cave, or in a hypoxic environment.
Hypoxic environment is exactly the conditions methanogenic bacteria operate in to turn biomass into methane. [2]
> Converting atmospheric co2 (or methane) into plastic that gets buried in a landfill is net negative carbon balance for instance.
Except for the energy needed to convert the molecules, the energy needed to transport plastic to a landfill. Energy production and transportation both are powered by fossil fuels mostly.
Conditions on the forest floor typically facilitate aerobic decomposition which does not release methane. [1]
>If you want to lock up carbon, you need to take it from the plants and sequester it somewhere natural forces (rot, weathering) won’t break it back down again - like a house, or in a cave, or in a hypoxic environment.
Hypoxic environment is exactly the conditions methanogenic bacteria operate in to turn biomass into methane. [2]
> Converting atmospheric co2 (or methane) into plastic that gets buried in a landfill is net negative carbon balance for instance.
Except for the energy needed to convert the molecules, the energy needed to transport plastic to a landfill. Energy production and transportation both are powered by fossil fuels mostly.
[1]http://whatcom.wsu.edu/ag/compost/fundamentals/consideration...
[2]http://solarcities.eu/faq