Welcome to the lecture on agriculture and environment .I hope it is enough to make some of you decide on the career in the field of agriculture of science.As you all know,food is a basic human need and producing ......is a single great challenge facing the modern world.Developping nations have rapidly expanded populations,so agriculture should be centered to any development of agenda for those countries.What's more,75% of people in the developping world are dependent,directly or indirectly,on agriculture for their ......And for many low income countries,it's the most important sector of economy accounting for 50% of GDP. And sometimes it's primary if not only source of foreign currency.Now,of course,when I talk about agriculture ,I am using the term to ......more......growing food crops.Of course,......farming ,fishing and forestry are included.In order to come back wide scale food shortages,agriculture research programs are under way in many areas using......as one way to increase ......activities.But a world warming ,agriculture must also be sustainable .Let's look at the prochures that are not sustainable.Firstly,overgripping and intense cropping are two ancient but destructive practices that......soil fertility.Secondly,the modern idea of ......application......desastrous consequences for the health of the land.Region from the pollution of water sources to the destruction of wild life.