Support for Greta Thunberg is evidence of "white supremacy", "white privilege" and "white power", activists claim.

The 16-year-old environmental campaigner has gained international visibility for her climate activism, including a fiery speech to world leaders at the United Nations General Assembly where she accused them of stealing her dreams.

However some are questioning however why Greta, a white child, is gaining so much attention over indigenous activists. They say that Greta is benefiting from a "global system of white supremacy" which has given her "privilege and a platform".

"Y'all need to ask yourselves why you find it so much easier to hear from white people, regardless of age, when it comes to the violence they have caused across the world," No White Saviours tweeted.

"It is a SYMPTOM of global white supremacy that certain people are HEARD & given a platform, certain people have access to the RESOURCES to be the HEROES that the world will pay attention to."