Our farmers feed the world. They are up before dawn and work till well after sunset. They face any number of challenges they can't control, from too much rain to not enough, from disease to insect infestations.
What I like about sceptics is that in good science you need critics that make you think: 'Crumbs, have I made a mistake here?' If you don't have that continuously, you really are up the creek. The good sceptics have done a good service, but some of the mad ones I think have not done anyone any favours.