At Franklin Pierce, he said that he was sure that human beings had contributed to climate change, but he wasn't sure how much, and suggested that, as President, he would select a group of leaders to pinpoint what to do.
Reformsters are sure that human beings must be motivated by threats and rewards, and that the lack of threats and rewards means that I can too easily choose to do a crappy job, because it won't make any difference.
Even so, he is sure that human ingenuity will generate new jobs, just as it created vast new industries to counteract the decline in agricultural employment.Technological dislocation may create great problems for moderately skilled workers in the coming decadesErik Brynjolfsson and Andrew McAfee, both at MIT, also have high hopes for the long-term effect of robots and similar technologies.
Romain Charles, one of the crew members Esa's Mars 500 isolation study to simulate a 520-day return mission to the Red Planet, says: "I am sure that humans will colonise Mars and the Moon.
Consequently (and assuming that the costs were not too great — as patently they weren't), one can be sure that whatever it is about human beings that enables them to learn and use language would have been subjected to strong positive selection pressure once it began to emerge in our species.
In the same vein, those conducting military actions against terrorists must be sure that such efforts fully observe human rights.
The reason for inherent doubt in the validity of any given miracle is that the people cannot be sure that God and not a human is the author of the miracle.
She also says that without knowing the amount of starch in the surrounding soil, it's difficult to be sure that the grains came from human activity and didn't merely stick to the stones after burial.
If you absolutely must tell another human, be sure that it is someone who can keep a secret.
