If the Yellowstone volcano erupts the consequences would be catastrophic. The last explosion of the volcano took place 70.000 years ago, and it was truly devastating. Of course we have no way of knowing when Yellowstone will erupt again, and scientists don't think it's an imminent threat. But that doesn't stop NASA from planning to stop an impending Yellowstone eruption.
Based on past eruptions, we could assume that lava is not such a big problem as it never came out of the park's limits, according to Geological Institute of the United States. 
The ash, however, would create a huge plume that could reach up to 800 miles around Yellowstone. As the dust would begin to fall, o wind it could spread it all over the West, the Midwest areas all the way east to Chicago. The areas would be covered with soot that would reach 10 centimeters.
Ash clouds will also emit huge amounts of gas, mainly sulfur dioxide. These gases would then create a huge absorbent layer that would block sunlight from reaching the earth and reflect most of it back into space - leading to a cooling effect that would last for decades.
Again, however, there is no reason to worry. Scientists do not think this will happen in the next 100 years. But in any case, the NASA has the solution:
First, the US Space Agency teams will drill from both sides of the volcano, outside the boundaries of Yellowstone National Park. The piercing straight to the centre of the volcano as you understand it would be dangerous, both because of the heat and the instability that the holes in the heart of an active volcano would cause.
From there, scientists want to throw water which will be pumped from one side to the other with high pressure. The outgoing water will reach temperatures of up to 350 degrees.
The water that comes in will cool the volcano. and on leaving the other side, hot water will produce steam, which could be used to provide electricity to nearby residents.
According to her researcher NASA Brian Wilcox:
You'd need to incentivize geothermal companies to dig deeper to get warmer-than-usual water, but you'd get a return on your initial investment by generating electricity that can power the surrounding region for a potential period of tens of thousands of years. And the long-term benefit is that you prevent a future volcanic eruption that would destroy humanity.
If successful, the NASA method will cool Yellowstone at an estimated rate of one meter per year. At this rate, it will take thousands of years to cool enough and even more to ensure that it will no longer be a threat.
Unfortunately, the project will cost about 3,46 billions of dollars. Does Trump really know about cutting NASA cuts?
