This straight-talking on-line for young people comes with a warning that it's not based on media hype. Even as the longer climate trend increases, there is still variability—ups and downs—in the short term weather. Some animals, insects, and amphibians will become extinct. The oceans, covering roughly 70 percent of the earth's surface, absorb heat from the sun and redistribute it to the deep oceans slowly. As a result, people have been asking me a variety of questions about the scientific basis of what we are being told.
The Holocene optimum occurred from 6,000 to 5,000 years ago. Increasing the geographical coverage of low-level clouds would reduce greenhouse warming, whereas increasing the amount of high, convective clouds could enhance greenhouse warming. What mitigation options are most cost-effective? Humans produce so much carbon dioxide from cars, power plants, chemical plants, wasting electricity, wasting water, littering, that all that carbon dioxide goes up into the greenhouse gases and creates warmth. A website published by the Study of Environmental Arctic Change, the Conservation of Arctic Flora and Fauna, the Arctic Monitoring and Assessment Programme, and the National Oceanic and Atmospheric Administration. We need to modify the infrastructure for more commuter trains.
The link has a written record of the complete show of the Jeopardy Kids game for that day. Mitigation options can be compared quantitatively in terms of their cost-effectiveness and qualitatively in terms of the obstacles to their implementation and in terms of other benefits and costs. Scientists have monitored Earth's temperature with thermometers for 140 years, and it's gotten a little warmer. In the past 2½ million years, under climate change as great and as fast, very few animal and plant species went extinct, far less than 30%. Section 2: Causes Yes, human activities have increased , which a large majority of climate scientists agree is the main reason for the 1. And landfills release methane into the air as our garbage decomposes.
We live in a time where we wish for simple answers, and are, as a result, often handed slogan and photographs as if these represented to whole truth. The impacts of global warming are already being felt Carolyn. While most climate change generally happens slowly over time, there is evidence that episodes of rapid cooling have occurred in the past, with temperatures falling dramatically over periods of 10 to 20 years. The fossil fuels we are burning in ever-increasing amounts contributes to higher concentrations of methane, carbon dioxide and nitrous dioxide. Weather Service 323 million Farming Create successful wheat variety 1 million Kansas Agricultural Research Experiment Station 33 million U.
Stabilizing global temperature at its current level would be very difficult because it would require cutting the emission of heat-trapping gases all the way to zero. In the long term, shipping commerce will benefit from the opening of the Northwest Passage for longer periods of the year due to the loss of Arctic sea ice. The temperature record much before 1900 is not reliable for estimates of changes smaller than 1°C—1. Coastal urban settlements would be Page 686 able to react quickly within 3 to 5 years if sea level rises. By the year 2100, sea level is projected to rise another one to four feet. Current scientific understanding of greenhouse warming is both incomplete and uncertain.
Scientists can assess whether a specific event e. In a warmer world, this contrast will probably weaken since surface temperatures in high latitudes are projected to increase more than at the equator at least in the northern hemisphere. Well, certain things in the atmosphere, like carbon dioxide from automobiles, can make Earth get warmer. Climate Change: Evidence and Causes is written by a dozen climate scientists on behalf of the U. From geophysical principles, there is no problem in attributing all the warming experienced in the last century to emissions of greenhouse gases. What they do not demonstrate is that there is nothing to worry about.
If the world is warming, why are some winters and summers still very cold? We also know that certain gases in the atmosphere can cause warming if more of those substances are able to accumulate in the atmosphere. Pinatubo erupted with such force it injected sulfate gases and particles into the stratosphere, above where rain clouds form. In fact, however, climate is always changing and is not in a steady state. Businesses can offer low-carbon-emitting products and services to customers who are seeking them. Some marine organisms such as corals and some shellfish have shells composed of calcium carbonate, which dissolve more readily in acid. Yeah, I learned about it from the news reporters, but they learned about it from scientists.
Strictly speaking, water vapor is the major greenhouse gas by concentration; the rest are minor constituents of the atmosphere. Getting Down to Businesses and Governments 1. Rising global temperatures are just one of the many indicators of climate change. Yes, for three different kinds of reasons. These changes can be a threat to humans as noted above in answers to previous questions.