## # A tibble: 215 x 8
##     Year `Solid Fuel` `Liquid Fuel` `Gas Fuel` Cement `Gas Flaring`
##    <dbl>        <dbl>         <dbl>      <dbl>  <dbl>         <dbl>
##  1  1800           69             0          0      0             0
##  2  1801           73             0          0      0             0
##  3  1802           79             0          0      0             0
##  4  1803           81             0          0      0             0
##  5  1804           91             0          0      0             0
##  6  1805           93             0          0      0             0
##  7  1806           91             0          0      0             0
##  8  1807          103             0          0      0             0
##  9  1808          107             0          0      0             0
## 10  1809          110             0          0      0             0
## # ... with 205 more rows, and 2 more variables: `Per Capita` <dbl>,
## #   `Bunker fuels (Not in Total)` <dbl>

We compared the temperature and precipitation change in DC between 2008 and 2018. The black line is for 2008 and blue line is for 2018. It looks like the temperature increased a little in 2018. During winter and summer months, the temperature in 2018 is overall higher than 2008.It might be an indicate of the climate change. Also we have more precipitation in winter and less precipitation in summer in 2018 compared with 2008.

We also examined the CO2 trend and found that it has increased a lot from 1980 to 2010. CO2 emissions is the most important reason that causing climate change.

CO2 emissions come from the using of fossil fuels. By the year 2000, gas fuel and liquid fuel are two major parts contribute to the CO2 emissions.