Thank you for sharing this informative piece. I am fully behind the cause but do feel you have sensationalized it a small bit. We need to highlight the positive efforts too, showing that change is possible.
The ozone layer is the best example. Due to a collective international effort of over 200 countries, formalized in the Montreal Protocol of 1987, the ozone layer has recently been observed to be recovering, and if progress continues, it is estimated to be back to pre 1980 levels by 2050 in northern latitudes.
To balance the above though, the most optimistic forecasts for the faith of our coral reefs is not so positive, even if vast improvements are implemented immediately. Up to 25% of the worlds marine fish species depend on the reefs.
Far more does need to be done, but a more absolving approach could be more encouraging.

Reference of Ozone recovery: http://onlinelibrary.wiley.com/doi/10.1002/2017GL074830/abstract