Farmers Cope With Roundup-Resistant Weeds

American farmer's use of the weed killer Roundup has led to a rapid growth of new tenacious weeds. These new weeds are Roundup resistant and to cope with the problem, farmers from all over the U.S. have to pull weeds by hand, spray more herbicides and do more labor intensive work. Experts say that such efforts could lead to lower crop yields, rising farm costs, higher food prices and more pollution to land and water. Click here to read more about the roundup resistant weeds.