This is a good article as it relates to what should be addressed to avoid annihilation. However, 70 years on after 1947 no one would launch a nuclear war and expect to survive beyond launch day in 2020. Surely, whomever launches first strike nuclear acquisition, whether right, warranted or otherwise, becomes an instance public target worldwide. The odds of survivability for anyone who attempts first strike tactical nuclear attack is not even remotely possible. Lethal find public appearances would leave whoever it is acquired. There would be no place to hide in public ever again. Nuclear weapons beyond 1945 meant one thing only, defense. Any offensive nuclear strike in 2020 and beyond is lethal to anyone who launches such suicide. And it is absolutely just that. At least one billion grandmothers, some even with Alzheimer's disease, would insist on the death of whoever launches first strike. There would be a lot of no-nooky until the boys carried it out. Extremely unscientific, but you can believe it.
And Global Warming/Climate Change? There is not a REAL scientist in the world that will argue that the climate hasn't been changing for 4.5 billion years and won't continue to change nor should it. It is not wise to enter a bated argument of climate scale with anyone who utilizes weather/climate data generated in a limited time scope post 1880. 90% of our Earth-time past climate and temperature has been cooler than today, and sometimes much cooler, however, 10% of our Earth-time past climate and temperature has been warmer, and sometimes much warmer than today. The real argument is one of good stewardship of our Earth. And rightly, corporations with good stewardship of our environment is a huge media advantage in the 21st century. More unforgiving in terms of Doomsday is our planet running out of oil, natural gas and coal that ends next century. For oil? There is 44 years of remaining Proved Oil Reserves on Earth. Probable Recoverable Reserves are also taken up in shear growth within a decade of this. 188 countries have less oil than the U.S. consumes in one year. 147 countries have less oil than the U.S. consumes in ten days. And, 123 countries have less oil than the U.S. consumes in one day. When hoarding begins the Doomsday clock ticks up critically. Our world needs to get to Thorium reactors (that can't blow up), recycling nuclear waste such as Bill Gates' TerraPower, tidal surface energy, garbage to energy existing technologies, and electric vehicles quickly and massively, and, much faster than our current progress. Private funding for wind and solar is fine if you can afford it but most of the world can't. One in five humans of this world does not have access to electricity, for starters. If the United States attempted to replace oil, natural gas and coal with solar PV it would require approximately one acre in every 6.79 acres of the entire United States, excluding surface water acreage, or, 6 acres for every megawatt needed at-load. The United States currently does not have the desire to deforest the country to power it up by those who've done the real math. The Doomsday Clock is a good navigator for recognition of what needs to be addressed, and for some issues, more promptly. No doubt.