The U.S. state at by for from in of on over through California is going at by for from in of on over through the worst drought at by for from in of on over through its history. Water supplies are now at by for from in of on over through dangerously low levels. The state government has introduced many laws to try to prevent water shortages. California farmers have stepped at by for from in of on over through to do their part at by for from in of on over through helping to conserve water. California's agriculture sector has agreed to cut back at by for from in of on over through its water use by 25 per cent. This will be at by for from in of on over through a voluntary basis. The agreement follows a move at by for from in of on over through California's governor Jerry Brown to cut water use at by for from in of on over through cities by 25 per cent. This was introduced as an emergency measure and it made many city residents angry. They did not want to be the only people having to cut back at by for from in of on over through water. California's water system serves at by for from in of on over through 30 million people and irrigates nearly six million acres at by for from in of on over through farmland. It is the world's largest and most productive water system. It is also one at by for from in of on over through the most difficult systems because too many people want too little water. There is a great demand at by for from in of on over through water at by for from in of on over through the state. Farmers say it is important they get water first because growing food is essential. However, some crops, like almond trees, need a lot at by for from in of on over through water. People at by for from in of on over through the cities say they need water the most to be able to live. There is also demand at by for from in of on over through California's many golf courses and at by for from in of on over through the swimming pools at by for from in of on over through the wealthy people in the state. California’s population will be almost 50 million people at by for from in of on over through the year 2020.