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If we weren't so sloppy there wouldn't be pollution in the first place. There wouldn't be radioactive material and excess CO2 and trash everywhere.
There's plenty of radioactive material in the environment already. As for garbage and chemical pollution, yes, any more than is necessary is our fault. However, we must accept that, at our current level of technology, there is a certain necessary amount. There are industries we need that just plain produce a certain amount of pollution, which we can't cut down on without either one, improving our technology, which we will do eventually but can't do immediately, or two, causing damage to our own civilization. It is naive to assume that we can reasonably get rid of all the pollution we're creating.
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We aren't doing nearly enough to keep the planet a healthy environment for life.
That, at least, is definitely true.
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Every gun that is made, every warship launched, every rocket fired signifies in the final sense, a theft from those who hunger and are not fed, those who are cold and are not clothed. This world in arms is not spending money alone. It is spending the sweat of its laborers, the genius of its scientists, the hopes of its children.
Well, you have to be careful how you look at this. Objectively, yes, violence against other people is a waste and I'm looking forward to the end of it. But nevertheless it is sometimes necessary for us to fight in order to prevent other people from infringing on the rights of either us or someone else. So long as the initial immoral act that triggered the fighting was done by somebody else, it is possible to fight and still know that we are not damaging our civilization as a whole by doing so.