Should we have the blue?

Should we have the blue
For temperatures, volcanoes,
Teleconnections
And hydroclimate too?

Higher temperature, denser wood
I thought this was understood
But wait, it may be diverging
And challenge our understanding.

And there in the tropics
Warm often and seasonally humid
To see all the control factors
You may add hydro to the mix.

Tambora erupted
A decade the blue interrupted.
Should we have the blue?
I think so, do you?