"Essentially, by 2050 we need all activities outside agriculture to be near zero carbon emitting if we are to stop carbon dioxide levels in the atmosphere growing"

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There are unidentified flying objects. That is, there are a hard core of cases-perhaps 20 to 30 percent in different studies-for which there is no explanation. We can only imagine what purpose lies behind the activities of these quiet, harmlessly cruising objects that time and again approach the Earth. The most likely explanation, it seems to me, is that they are simply watching what we are up to

— Margaret Mead