Methane is a greenhouse gas 300 times as potent as CO2, so it would be
capable of warming the planet, even with the weaker sun.
I read (i believe it was on a skeptics site actually) that there are 4 things
capable of warming the planet on a global scale.
Not exact matches
An active hydrological cycle would have required a
warmer climate in the
planet's early history and therefore a thicker atmosphere, one
capable of creating a strong greenhouse effect.
They are also wrong in assuming that the Sun was
capable of warming the surface
of Venus, Earth or other
planets to the observed temperature which is then maintained by back radiation being supposedly the only process that slows such surface cooling.
Heavy snowstorms are not inconsistent with a
warming planet... In fact, as the Earth gets
warmer and more moisture gets absorbed into the atmosphere, we are steadily loading the dice in favor
of more extreme storms in all seasons,
capable of causing greater impacts on society... If the climate continues to
warm, we should expect an increase in heavy snow events for a few decades, until the climate grows so
warm that we pass the point where it's too
warm for it to snow heavily.
These traits have led scientists to study the Brangus as they look to engineer a new type
of cow
capable of withstanding a
warming planet.