Question

Effects of climate variability and climate change

Answer 1

Global warming is a prominent part of the climate change expected in association with the observed increases in greenhouse gas levels brought about by man's activities. Yet natural variations, such as those associated with El Niños, make it difficult to detect anticipated climate changes. In addition, detection in the observational record of the expected global warming is confounded by flawed and patchy observations and because observed climate change is not geographically uniform. This paper discusses the difference between weather and climate and analyzes examples of recent climate anomalies, including the 1988 North American drought. It also summarizes the climate changes expected from increased greenhouse gas concentrations in light of the observational record.

The observed patterns of temperature change over the globe are not yet well accounted for by climate models. Nevertheless, climate models are the best tool we have for quantifying the complex processes involved in climate change and for making future projections. Large natural variability will continue to be a major factor to be planned for, and any changes in the incidence or kind of El Niños could have profound impacts in the western United States.

Answer 2

Explanation:

given triangle is right angled triangle

follow pythagoras theorem

42+32=C2

by solving

you will get 3rd side

C=5

so we know that

sinA = perpendicular/Hypotenuse

=) given B=90° so in triangle side apposite to 90°is Hypotenuse and side having 99°is perpendicular

so, SinA=AB/AC=4/5=0.8