Climate change is a change in the statistical distribution of weather patterns when that change lasts for an extended period of time (i.e., decades to millions of years). Climate change may refer to a change in average weather conditions, or in the time variation of weather around longer-term average conditions (i.e., more or fewer extreme weather events). Climate change is caused by factors such as biotic processes, variations in solar radiation received by Earth, plate tectonics, and volcanic eruptions. Certain human activities have also been identified as significant causes of recent climate change, often referred to as global warming.
Scientists actively work to understand past and future climate by using observations and theoretical models. A climate record—extending deep into the Earth's past—has been assembled, and continues to be built up, based on geological evidence from borehole temperature profiles, cores removed from deep accumulations of ice, floral and faunal records, glacial and periglacial processes, stable-isotope and other analyses of sediment layers, and records of past sea levels. More recent data are provided by the instrumental record. General circulation models, based on the physical sciences, are often used in theoretical approaches to match past climate data, make future projections, and link causes and effects in climate change.
This topic looks at evidence of climate change, contributing factors, initiatives to limit climate change and opinions on climate change.
The end of the year is nigh and it's a time for Christmas and New Year parties and gatherings. In the southern hemisphere that means barbecues and beaches. In the northern hemisphere it's mulled wine and cosy fireplaces.
Ever wonder how your tiny carbon footprint really impacts the big picture of climate change? Though you might feel like your lifestyle is insignificant compared to things like oil extraction or vehicle emissions, the choices we make in our day-to-day life - how we get around, what we eat, how we live - play a major role in slowing climate change.