Question

carbon dioxide level
year co₂ ppm
1960 317
1970 326
1980 339
1990 354
2000 371
2010 390
what conclusion can you make about how the carbon dioxide level has changed over time?
the level has not changed.
the level of co₂ has declined.
the level of co₂ has risen.
the level has reached its maximum.

Explanation:

By observing the data in the table, the CO₂ PPM values increase from 317 in 1960 to 390 in 2010 over the given time - span.

Answer:

The level of CO₂ has risen.