Current CO2 Live – CO2Now.org displays the current concentration of atmospheric CO2 as measured at the Mauna Loa Observatory in Hawaii. Measurements are taken with high precision instruments at a remote location where CO2 is well mixed in the atmosphere, more than two miles above sea level.

Sustainability Explained – Sustainability is the capacity to endure. It can be defined in biological terms as the ability of an ecosystem to maintain ecological processes, functions, biodiversity and productivity into the future. In ecology, the word describes how biological systems remain diverse and productive over time.

Pozzolana – Pozzolana, also known as pozzolanic ash, is a fine volcanic ash, originally discovered and dug in Italy at Pozzuoli in the area around Vesuvius, however later at several other sites. Vitruvius speaks of four types of pozzolana: black, white, grey and red, all of which can be found in the volcanic areas of Italy, such as Naples.

Recycled Concrete – Construction and demolition waste material in America is around 136 million tons per year, or about 3 lbs per person, per day. Recyclable materials such as concrete and aggregates can be recycled at the end of their serviceable life as a buildings, pavement, driveways or other structures – limiting the quantity of waste concrete and aggregates that is land filled and reducing the requirement for new materials in new concrete construction projects.