Five sentences related to a topic are given below. Four of them can be put together to form a meaningful and coherent short paragraph. Identify the odd one out.

1. As India looks to increase the number of cities, our urban planning must factor in potential natural disasters and work out contingencies in advance.
2. Authorities must revise data and upgrade infrastructure and mitigation plans even if their local area hasn’t been visited by a natural calamity yet.
3. Extreme temperatures, droughts, and forest fires have more than doubled since 1980.
4. There is no denying the fact that our baseline normal weather is changing.
5. It is no longer a question of whether we will be hit by nature's fury but rather when.

If we read all the sentences together, we see that the author is arguing for India preparing itself in advance for future natural disasters. Sentence 4, which introduces the broader context makes for a good opening line. Sentences 1 and 2 together make the main point that the author is trying make through the paragraph - that India should prepare itself for future natural disasters. Sentence 5 emphasizes the main point by adding that natural disasters will occur in the future and thus makes for a good concluding line. 

Sentence 3, that talks about extreme temperatures does not lead off to any of the other sentences nor does it add to any of the other sentences. Hence, it is the odd one.

Additional Explanation:

1-2 is a block, both are talking about things that authorities should do 45 are rhetorical opinions of the author on the weather. 3 is a fact. We use facts to draw reasonable conclusions. This standalone fact cannot be used to draw any conclusion. The style of the author's writing in 4 and 5 are more opinionated than factual. So 3 is a misfit. Moreover, we cannot make a connection between 1-4, 1 says we need contingencies for natural disaster(suggestive) whereas, 4 says whether is changing(rhetorical).