Manufacturing synthetic fertilizers is not environmentally friendly. Synthetic fertilizers depend on non-renewable resources and use large amounts of energy to manufacture and transport. Organic fertilizers can also use energy to transport and mine, but many organic gardeners use local resources that would otherwise be wasted. Well, actually, nothing. Everything has chemicals.
Water is a chemical.
Try to use the word synthetic instead of chemical. Organic gardeners use natural chemcials that breakdown quickly and don't harm the environment. A lot of stuff that organic gardeners use comes for the kitchen. Other chemcials we use come from plants, animals and bacteria in our natural environment. Synthetic pesticides and herbicides can be much more persistent - they don't breakdown as quickly.