A decade ago Scientist discovered what is known by the Indios as Terra Preta or Black Earth and turned out be a part of instruments at our disposel to combat climate change. A incredible BBC documentary from 2002 reveals this story.

Talk by Mike Cheiky, President and Founder of CoolPlanet Energy Systems, which is developing carbon negative fuels with Biochar.

Mashable:
Big Idea: Utilize organic waste to create carbon-negative charcoal, a substance that pulls CO2 from the air and helps crops grow taller and stronger.

Why It’s Working: Re:char’s mission is about providing farmers — both at home and in developing countries such as Kenya — with conservation-oriented soil-boosting complexes that can double food output compared to traditional farming methods.

ReChar started a Kickstarter project funding:
Black Revolution is a soilless growth media for plants containing biochar, coconut husk and compost. Biochar is a charcoal soil amendment made from waste that improves nutrient retention, offsets CO2 and has the potential to help feed our growing planet. Black Revolution is the world's first carbon-negative replacement for soil made entirely from waste. It's lighter than traditional soil, so it works great in rooftop or urban environments. The potting soil and chemical fertilizer industries are traditionally some of the most environmentally destructive in the world.

Chemical fertilizers require massive amounts of fossil fuels and pollute our rivers and streams. Potting soils contain peat moss and vermiculite: non-renewable resources mined from endangered areas around the world.

http://terra-preta-gardens.com/

In this video, KVIE profiles Jules Dervaes, a man who has turned his small suburban yard into a profitable organic farm. Dervaes says what started out as a hobby became serious for him with the advent of genetically modified foods and rising food prices.
With the help of his family, they now produce over 6,000 pounds of food annually on their 1/10-acre land, though their goal is to hit 10,000 pounds. The 350 varieties of organic fruits and vegetables grown not only sustain the Dervaes family, but the large surplus is sold to local restaurants and catering companies.
Setting an example as to what's possible in city farming and sustainability, the Dervaes family even makes their own bio-fuel for their minimal vehicle usage. Huffington Post

This ambitious documentary/drama/animation hybrid stars Pete Postlethwaite as an archivist in the devastated world of the future, asking the question: "Why didn't we stop climate change when we still had the chance?" He looks back on footage of real people around the world in the years leading up to 2015 before runaway climate change took place. IMDB Support Spanner Films & Buy the full DVD Movie with Extra Quality & Content