The air mass behind a warm front is likely to be warmer and more moist than the one before the front. If a warm front is approaching, light rain or light winter precipitation is possible before and as the front passes. Behind the front, expect clearing skies, warmer temperatures and higher relative humidities.
 
        
             
        
        
        
Anything that they do in Tibet would affect them
        
             
        
        
        
The answer to this is precipitation.
Precipitation is rain, snow, sleet or hail that falls to the ground. 
So precipitation is the answer.
Hope this helped :)
Have a great day 
        
                    
             
        
        
        
The pesticide will be in the animals that eat the grasshoppers, in the water table, in humans that eat the animals/crops and drink the water.