Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A:The increased emission of \(CO_2\) and \(CH_4\) from boreal and tundra soils in response to elevated \(CO_2\) and temperature will have positive feedback effects on climate change.
Reason R: Spring phenology in boreal ecosystems does not respond to climate change trends.
In the light of above statements, choose the correct answer from the options given below