Climate includes patterns of temperature, precipitation,humidity, wind and seasons. "Climate change" affects morethan just a change in the weather, it refers to seasonalchanges over a long period of time. These climate patternsplay a fundamental role in shaping natural ecosystems, andthe human economies and cultures that depend on them. Forexample, a change in the usual timing of rains ortemperatures can affect when plants bloom and set fruit,when insects hatch or when streams are their fullest. Thiscan affect historically synchronized pollination of crops,food for migrating birds, spawning of fish, water supplies fordrinking and irrigation, forest health, and more. Some short-term climate variation is normal, but longer-term trends nowindicate a changing climate. A year or two of an extremechange in temperature or other condition doesn’t mean aclimate change trend has been "erased.”Worldwide, people are paying serious attention to climatechange. In Washington state, climate change is alreadydisrupting our environment, economy and communities. Wecan help slow it down, but we must take action now.
CAUSES OF CLIMATE CHANGE On the broadest scale, the rate at which energy is received from the sun and the rate at which it is lost to space determine the equilibrium temperature and climate of Earth. This energy is distributed around the globe by winds, ocean currents, and other mechanisms to affect the climates of different regions. Factors that can shape climate are called climate forcings or "forcing mechanisms". These include processes such as variations in solar radiation, deviations in the Earths orbit, mountain-building and continental drift, and changes in greenhouse gas concentrations. There are a variety of climate change feedbacks that can either amplify or diminish the initial forcing. Some parts of the climate system, such as the oceans and ice caps, respond slowly in reaction to climate forcings, while others respond more quickly.
Forcing mechanisms can be either "internal" or"external". Internal forcing mechanisms are naturalprocesses within the climate system itself (e.g.,thethermohaline circulation). External forcingmechanisms can be either natural (e.g., changes insolar output) or anthropogenic (e.g., increasedemissions of greenhouse gases).Whether the initial forcing mechanism is internal orexternal, the response of the climate system mightbe fast (e.g., a sudden cooling due toairbornevolcanic ash reflecting sunlight), slow(e.g. thermal expansion of warming ocean water), ora combination (e.g., sudden loss of albedo in thearctic ocean as sea ice melts, followed by moregradual thermal expansion of the water). Therefore,the climate system can respond abruptly, but the fullresponse to forcing mechanisms might not be fullydeveloped for centuries or even longer.
The effects of global warming are the ecological and socialchanges caused by the rise inglobal temperatures. Evidence of climate change includes the instrumentaltemperature record, rising sea levels, and decreased snow cover in theNorthernHemisphere. Most of the observed increase in global averagetemperatures since the mid-20th century is very likely due tothe observed increase in human greenhousegas concentrations. Projections of future climate changesuggest further global warming, sea level rise, and anincrease in the frequency of some extreme weather events.
TERRIFYING IMAGEMany people seem to have gotten a little comfortable with the concept ofglobal warming. Thats not to say anyones alright with it—in fact, most peopleactively want to help fight climate change. But gone are the days when theconcept of climate change first terrified the public as a kind of looming,inevitable apocalypse.
GREENHOUSE EFFECT IMAGEThese gases, mainly water vapor ( ), carbon dioxide (), methane (), andnitrous oxide (), all act as effective global insulators. To understandwhy, its important to understand a few basic facts about solar radiationand the structure of atmospheric gases.
San Rafael Natinal High School San Rafael,Tigaon,Camarines Sur In Partial Fulfillment of Requirements In Science and Technology 2The Impact of Climate Change in the Society Presented by: Miguel Louis G.Faurillo 2 Newton Presented to: Jose Rizal Instructor