Many news outlets are reporting how atomic scientists have reduced the doomsday clock. I had never heard of the doomsday clock until today. An article on CNN states:

The Bulletin of the Atomic Scientists was founded by a group of atomic scientists who worked on the Manhattan Project, the code name for the development of the atomic bomb during World War II. Originally, the organization was conceived to measure nuclear threats, but in 2007 the Bulletin made the decision to include climate change in its calculations.

Should a Christian be worried about the opinion from a group of atomic scientists regarding climate change, nuclear war, pandemics, etc.?

NO.

2 Peter 3:10-12 

But the day of the Lord will come like a thief, and then the heavens will pass away with a roar, and the heavenly bodies will be burned up and dissolved, and the earth and the works that are done on it will be exposed. Since all these things are thus to be dissolved, what sort of people ought you to be in lives of holiness and godliness, waiting for and hastening the coming of the day of God, because of which the heavens will be set on fire and dissolved, and the heavenly bodies will melt as they burn!

Picture credit and source: CNN.com