Return to your position from the introduction, using different words.
In conclusion, I firmly maintain that [position], as the evidence presented in this essay clearly demonstrates.
To summarise, my view that [position] is supported by both [reason 1] and [reason 2], as outlined above.
In conclusion, it is my belief that [position] represents the most effective and sustainable approach to [issue].
Close with a broad, forward-looking statement. Do not introduce new arguments.
Taking everything into account, the advantages of [position] clearly outweigh any potential drawbacks.
For these reasons, I am convinced that [position] is the most viable path forward for [individuals/governments/society].
Should this approach be adopted more widely, the long-term benefits to [society/the environment/individuals] would be considerable.
In conclusion, I firmly maintain that governments should prioritise investment in renewable energy, as both the environmental and economic arguments in its favour are compelling. Taking everything into account, a decisive transition away from fossil fuels represents not only the most responsible choice for current generations, but also the most sustainable legacy we can leave for those who follow.