Life on Earth depends on liquid water and the temperature at which it freezes or boils.How much would the values of 0°C and 100°C need to change to make life here unsustainable, or hugely different?I'd like to be able to take comfort by speculating about how things might have turned out differently in another time-line, but that's not so good either.Imagine the Brexit referendum and the US Presidential election results were flipped: where would we be now? note Hubble_ultra_deep_field_high_rez_edit1 is much larger  Hubble ultra deep field high rez edit1_Deutsch: Das Hubble Ultra Deep Field ist ein Bild einer kleinen Himmelsregion aufgenommen vom Hubble-Weltraumteleskop über einen Zeitraum vom 3. Man entschied sich für ein Zielgebiet südwestlich von Orion im Sternbild Chemischer Ofen. Dabei wurde eine Himmelsregion ausgewählt, die kaum störende helle Sterne im Vordergrund enthält.Every month Craigslist (not just the online personals section) gets more than 20 billion page views from over 50 million users in the United States alone.
In almost 15 years this classifieds website has grown to become the seventh largest English language website.My 8-year-old son is very worried about Earth being destroyed by the sun when it becomes a red giant billions of years from now. They are deciduous and their leaves turn bronze in the autumn, but they don't fall off the tree.