Snow is white, and thus has a albedo than bare ground. if global warming decreases snow cover, the resulting change in albedo is likely to further warming.

 higher;  increase .

     Snow is white, and thus has a   higher  albedo than bare ground. if global warming decreases snow cover, the resulting change in albedo is likely to  increase  further warming.

Ithink its deforestation.

343^x = 49^4-xx = 4-xx+x=42x = 4x = 4/2x = 2therefore x = 2