Climate change refers to a change in the state of the climate that can be identified (e.g., by using statistical tests) by changes in the mean and/or the variability of its properties and that persists for an extended period, typically decades or longer. Climate change may be due to natural internal processes or external forcings such as modulations of the solar cycles, volcanic eruptions and persistent anthropogenic changes in the composition of the atmosphere or in land use. [AGROVOC]

Climate-smart agriculture (CSA) is agriculture that sustainably increases productivity, resilience (adaptation), reduces/removes green house gases (mitigation), and enhances achievement of national fool security and development goals.

The state of the atmosphere at a definite time and place with respect to air temperature, humidity, wind, precipitation, cloudiness, etc.