In the world of ‘fake news’ and ‘alternative facts’, ‘facts’ and ‘science’ exist.  The most pertinent question of our time involves whether current trends in climate on Earth have anything to do with humans and their use of fossil fuels, coal and oil. Climatologists, such as Michael Mann, develop mathematical models based on the Lorentz equations from the 60s  – a simplified version of turbulent flows in fluid dynamics and in the atmosphere. These equations have solutions called ‘chaos’.
If climate change – including global warming, with sea rise and acidification, hurricanes, tornados, droughts, and forest fires – exists, one can ask ‘why’ and ‘when’ (and ‘who’).    Most experts agree on climate change. Alaska and North Dakota used to be oceans.  The scientific consensus on ‘why’ it is currently happening is that it is due to human activities -burning of fossil fuels used for heating, cooling, transportation, and agriculture. Some disagree that human-caused climate change exists and that, even if it does, it is not an issue. The world will live in summertime all year, and Miami and other coastal cities can just move away from the ocean.
The dynamics of climate change are unclear – ‘if’ it is happening one can ask ‘when’ one will notice it. The Arctic permafrost is already melting. The consensus is that within the next two decades it will become a lot more noticeable.
The last issue is ‘who’ this involves. There are disputes between environmental groups, fossil fuel lobbyists, and the Trump administration about ‘who’ is involved.  It is likely that everyone is involved to some extent.
The Trump administration is attempting to erase all scientific data on climate change. If they are successful, these questions could remain unanswered for a long time.

Awful, average or astonishing? You decide: