Tone Assessment in Climate Change Discourse

In the following excerpt from an article discussing climate change, the author states:

"The relentless march of climate change presents not only a dire challenge to ecosystems worldwide but also an urgent call to humanity. As pollution levels rise and glaciers retreat, it becomes increasingly clear that our collective inaction could lead to catastrophic repercussions that will threaten future generations. To ignore the signs is to gamble with our planet's very future."

Considering the author's choice of words and overall message, how would you describe the tone of this excerpt?