Amid scores of conferences over the last 20 years, CO2 in the atmosphere has risen 41ppm to dangerously high levels.

Amid scores of conferences over the last 20 years, CO2 in the atmosphere has risen 41ppm to dangerously high levels.

Has BP hired internet “trolls” to threaten critics of its handling of the 2010 oil disaster?
![Critics using BP America's Facebook page allege they have been harassed [Erika Blumenfeld/Al Jazeera]](https://aljazeeranews.edgeone.app/wp-content/uploads/2013/11/201310237204919734_20.jpeg?resize=270%2C180&quality=80)
Toxicologists ‘predicted with certainty’ that Gulf of Mexico residents and clean-up workers would become severely ill.
![A slick PR job has not stopped the spread of anti-BP sentiment in the wake of health problems [Reuters]](https://aljazeeranews.edgeone.app/wp-content/uploads/2013/10/201310124721469734_20.jpeg?resize=270%2C180&quality=80)
Three years after well blowout, declining seafood catches and deformities point to an environment in distress.
![Over three million pounds of oiled material have been found in Louisiana this year [Erika Blumenfeld/Al Jazeera]](https://aljazeeranews.edgeone.app/wp-content/uploads/2013/10/2013102081411321580_20.jpeg?resize=270%2C180&quality=80)
2010 oil spill has left a legacy of psychological and social problems among residents in the impact zone.
![John Gooding has suffered physical problems and now struggles with depression as well [Erika Blumenfeld/Al Jazeera]](https://aljazeeranews.edgeone.app/wp-content/uploads/2013/10/2013101514030970734_20.jpeg?resize=270%2C180&quality=80)
Two US-led wars in Iraq have left behind hundreds of tonnes of depleted uranium munitions and other toxic wastes.
![Bombed buildings like this one in Fallujah litter Iraq, and remain toxic sites that likely continue to cause illnesses [Dahr Jamail/Al Jazeera]](https://aljazeeranews.edgeone.app/wp-content/uploads/2013/03/2013315175129306734_20.jpeg?resize=270%2C180&quality=80)
Despite Obama’s promises to close it, the prison remains open with no end in sight.

As climate change become increasingly apparent, many wonder why the Green Party is being ignored in the US election.

Spate of executions, mass detentions and alleged torture raise concerns over country’s human rights situation.

As the Rio+20 conference closes, radical change remains necessary, experts tell Al Jazeera.
