The poll comes at a critical time for governments as they plan stimulus packages to recover from the COVID-19 slump that will influence future generations, she added.
"Thank you so much for all the well-wishes on my 18th birthday!," Thunberg said on Twitter.
Docaviv Galilee goes online
For decades the world has been swatting away evidence of climate change. But we need to confront it.
She said that she never engages in party politics, but that "the upcoming US elections is above and beyond all that."
"It will affect all children, now and in the long-term, but vulnerable groups will be impacted the most."
"Today is Earth Day and that reminds us that climate and the environmental emergency is still ongoing and we need to tackle both the corona pandemic... at the same time as we tackle climate."
"Though it must be in a different way to how we have acted in this case, we can act fast and change our habits and treat a crisis like a crisis."
A growing number of countries are banning large public gatherings as part of efforts to curb the spread of the virus.