A drop in the ocean

Sitting in the dark, I wonder,
Will it be of help? I ponder,
The message is out, loud and clear,
But, is it as bad as we fear?

My little part, that I play,
Accumulate, it will, day by day,
Leave it behind, as my legacy,
Not just rely on others' mercy.

As I observed the earth hour,
The neighborhood, I did scour,
There are others who believe,
Actions will provide the reprieve.