1. How does the climate change that scientists are observing now compare with climate change in the past?

look below

Explanation:

Scientists have been observing Earth for a long time. ... Why does it matter that Earth's Climate is changing? ... However, today the planet is warming much faster than it has over ... In fact, the past five years have been the warmest five years in centuries. One-and-a-half degrees may not seem like much.

Carbon Dioxide Emissions from Fossil Fuels Grew 10%

Explanation:

The Global Carbon Project reported earlier this month that global carbon dioxide emissions from fossil fuels and cement are on track to climb to a record high in 2019. While global emissions growth plateaued between 2014 and 2016, it was short-lived: Emissions from fossil fuels grew 1.5% in 2017, 2.1% in 2018 and are projected to grow another 0.6% in 2019.

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.