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Topic sentence in first body paragraph could be more coherent to the topic, it should be bit specific.
Tone of first body paragraph is what government should do , rather keep these points but present them like reasons why people think it’s government duty.
So, both the governing bodies and their nationals should work on a methodology which will safeguard their existing resources for their future generations.
(So, not only governing bodies but their nationals should work collectively on a methodology which will safeguard their existing resources for their future generations.)
Keep writing!!