cause and effect

The world's population is growing rapidly .......... there are food shortages.

Food prices are rising ............ demand has outstripped supply. 

GM crops can .............. higher crop yields.

Population growth .......... increased demand for food.

Millions of people don't have enough to eat .......... farmers aren't producing enough food. 

Farmers are using old-fashioned techniques .... their land is underproductive.

A rise in the price of staple foods ............. population increase.

High food production ............. modern farming techniques. 

Farming difficulties .............. global warming. 

Lower consumption of meat would ............. more staple food on world markets.