The ecological footprint is a measure that compares human demand on natural resources with Earth's capacity to regenerate those resources. It estimates the amount of biologically productive land and sea area required to support human consumption and waste absorption. Key factors that determine ecological footprint include energy and resource consumption, land and sea use, and levels of biodiversity and carbon emissions. Most recent data from 2010 showed that humanity's ecological footprint exceeded the Earth's capacity to regenerate resources by August 21st that year, the date defined as "Earth Overshoot Day". The carbon footprint specifically measures the amount of greenhouse gases produced through activities like energy use, transportation and industry. Atmospheric levels of greenhouse gases like carbon dioxide, methane and nitrous oxide have substantially increased since