Solution – oxides of sulphur and nitrogen are the by – products of the fertiliser industry . Other products include solid , liquid chemicals and some solid waste materials . These results in massive environmental pollution and also causes global warming . They give rise to acid rain which is highly destructive in nature . These by – products also mix up with the soil and are taken up by the plants , which are eaten up by the animals and also by human beings . This endangers the life of human beings and also of the animals .