Stockholm, Sweden - Activist icon Greta Thunberg welcomes everyone to join her in the fight against climate change.

"My name is Greta Thunberg, and I'm inviting you to be part of the solution," the 17-year-old climate activist said as she introduces a three-minute video calling out current climate politics.

She posted the clip on Twitter and Instagram on Thursday.

Five years after the Paris Agreement, an international treaty between 196 parties to limit global warming to well below 35 degrees Fahrenheit, a lot has happened, she says.

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"But the action needed is still nowhere in sight," she continues.

The gap between what needs to be done and what is actually being done is widening by the minute, she explains, adding that the five years since the Paris Agreement were the warmest ever recorded.

As politicians set hypothetical goals, "we're still speeding in the wrong direction," the activist argues. Time is wasted on "net zero loopholes" and "empty promises."

Instead, Thunberg emphasizes the need for systemic change. "That's no longer an opinion. That's is a fact," she says.

Thunberg believes climate-change awareness is increasing, but people need to keep spreading the word.

"We cannot solve a crisis without treating it as a crisis. Nor can we treat anything like a crisis unless we understand the emergency," the Swedish activist contends.

Once everyone becomes aware of the crisis, they will act and bring about change: "This is the solution. We are the hope."