The two graphs show the main sources of energy in the USA in the 1980s and the 1990s. Write a report for a uni versity lecturer describing the changes which occurred.
in my countries today, people in cities either line alone or in small family uni ts, rater than in large, extended family groups. is this a positive or negative trend?
What do you think are the most effective ways a VinUni student can change their daily habits in order to have a positive effect on the environment?