For climate scientists, May 10, 2013, marked a historic moment: atmospheric carbon dioxide (CO2) reached a concentration of 400 parts per million (ppm) for the first time in human history. But the surpassing of a climate change threshold made barely a ripple in mainstream media, raising questions among climate justice activists about the efficacy of current strategies for capping greenhouse gas emissions.

Click here to read the full story by Crystel Hajjar for The Dominion.