2.we can save the earth only by learning to live in harmony with nature
3better education is not only important for improving ourselves but also for developing our society
4.if i had not listened to the speeches , i would not have realized that many of the things i do every day are bad for the environment
1--Until we watched the Earth Day programme on TV did we know much about global warming.
2--Only by learning to live in harmony with nature can we save the earth.
3--Not only does better education be important for improving ourselves but also for developing our society.
4--I realized that many of the things i do every day are bad for the environment only When I had listened to the speeches.