Join the two lists of words together so that the result is a sentence.
[global, efforts, reducing, CO2]
[contributing, climate, change]
Global efforts are reducing CO2 and contributing to climate change.
Complete the following task based on the instruction and optional input provided.### Instruction:
Join the two lists of words together so that the result is a sentence.

### Input:
[global, efforts, reducing, CO2]
[contributing, climate, change]

### Output:
Global efforts are reducing CO2 and contributing to climate change.