The increased amounts of carbon dioxide (CO2) and other greenhouse gases (GHGs) are the primary causes of the human-induced component of global warming.
Trees play no role in global warming.
They are hugely important to fight climate change.
( z1 play :polarity - :ARG0 ( z2 tree ) :ARG1 ( z3 role :topic ( z4 warm :ARG1 ( z5 globe ) ) ) )