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I have friends who are very pessimistic. They say you can't possibly be an optimist nowadays. But I think, taking the longer view, you can still be as optimistic as you want.

There's nothing particularly wrong with being more pessimistic than optimistic. Optimism is broad-based, non-detail-oriented thinking; pessimism is detail-oriented thinking.

I'm a kind of hard-wired pessimist. I can't help but see the world in a certain kind of way.

When asked if I am pessimistic or optimistic about the future, my answer is always the same: If you look at the science about what is happening on Earth and aren't pessimistic, you don't understand the data.

I'm an optimistic person.

By nature, I'm an optimistic person. No one believes it, but I am.

I always have an optimistic view, no matter what it is.

I am not a pessimist; to perceive evil where it exists is, in my opinion, a form of optimism.