Are conditions inside of "4 km slim" atmosphere where we all breathe getting worst? Strictly YES. And actually in last 50 years more than rapidly.
It is happening because world leaders selfishly ignored real world problems:
Europes original ancient forests already destroyed decades ago
Daily forest destruction. Over 1/2 forests all over the world already destroyed
Over 60 % of wild animals exterminated by humans race.
Street lights producing enormous pollution every night all around the planet
Combustion engines producing enormous heat and dirt NONSTOP for last 140 years
Industry is polluting our home in enormous scale
Lazines, aversion and oblivion of humans to do what should be done
...„Abnormal" air traffic density,
Wrong implementation of technology and systems, etc...
DO NOT RUN! Face the truth! : "Why to spent so expensive sources for trips to Mars if we even do not know how to live on The Earth?"
Status of "contamination" by humans:
year 1400 : 0.4 bilion
year 1500 : 0.5 bilion
year 1600 : 0.6 bilion
year 1700 : 0.7 bilion
year 1800 : 1.0 bilion
year 1914 : 1.74 bilion
end of year 2016 : 7.5 bilion
end of year 2019 : 7.7 bilion
...If data from internet correspond to reality
Daily humans.
Mexico (over 20 milion inhabitats)
World wide night by night street light heat production
made by human race.
REDUCE CONSUMPTION **
STOP(stop cuting trees)
RESTORE(tree fields called forests, seed trees)
REUSE( use even humans excrements as manure on fields ! )
CLEAN(water, land, cities, it goes hand by hand with recycling)
Learn to live among natural environment
Learn from historical events 🌎🌏🌍📅💻
**REDUCE CONSUMPTION Each person must stop rushing.
Reduce globally brightness and heat of city lights during the night about 70%.
Do not forget:
remind yourself of what humans did wrong and still did not stop with that.
! WORLD MEDIA ! All media all around the world have to show all day long how people destroyed the Earth but instead of this they showing how was a day on red carpet in Hollywood and screens are full of unreal heroes in movies.
COOPERATE WITH VIRTUAL WORLDS
SWITCH OFF your phones, computers, TVs for 10 days.
Can you do that?
Daily humans. 
Mexico (over 20 milion inhabitats) 
. . . 
...