2 The cost would be high because most emissions of greenhouse gases come from burning fossil fuels for energy, and the economic lifetime of energy equipment like power plants, buildings, and automobiles is long (two decades or more).
(The cost; would be; high; because most emissions of greenhouse gases come from burning fossil fuels for energy) (most emissions of greenhouse gases; come; from burning fossil fuels for energy) (the economic lifetime of energy equipment like power plants, buildings, and automobiles; is; long (two decades or more)
The cost most emissions of greenhouse gases the economic lifetime of energy equipment like power plants, buildings, and automobiles
would be come is
high because most emissions of greenhouse gases come from burning fossil fuels for energy
from burning fossil fuels for energy
long (two decades or more