The answer is - 30.
In the last 800,000 years, in a span of 1,000 years it never happened that the CO2 go upwards or downwards for more than 30 ppm. It has always been a slow process in this period and as much as the jumps were big, that never surpassed this number. On the other hand we are witnessing that this has happened nowadays in just 13 years, and that is very concerning because such rapid changes of CO2 in the atmosphere brings rapid changes in the climate and it will be a global catastrophe if this trend continues.
Answer:
C. Degrees Centigrade
D. Percentage of relative humidity
Explanation:
These are the two most common measurements (among the list of possible answers) to talk about weather and weather forecast.
These two cover the basic needs of weather prediction and warning for people. The degrees are given for sure, since that directly influences how you should dress to go out. Relative humidity is also given because when temperature is high, the humidity modifies the perception of the warmth.
You'll never hear the TV weather person talk about Roentgens or centimeters of mercury.
Answer: A. An explanation of the colors and symbols used on the map
Explanation: