Before the mass adoption of chemical pesticides, fertilizers, and mechanized farming equipment in the early 20th century, people had to rely on more natural methods of cultivating plants. Prior to these changes, gardening and agriculture changed relatively very little in the previous 10,000 years or so since humans first began cultivating plants. These methods have made a major resurgence recently as the damage done by chemical pesticides and fertilizers during the past 80 years has become more and more clear.