toxic

We see the same in companies with toxic corporate cultures, where it's just a matter of time that disaster strikes.

It's not toxic positivity.

We need some CO2 in our blood, but too much is toxic to cells.

Unless it's done very carefully, mining can contaminate rivers, wreck ecosystems and send highly toxic pollutants like mercury into the air.

And some plants, like the sage plant, salvia leucophylla, have evolved to secrete toxic chemicals that prevent other plants from getting too close and stealing away nutrients.