A circle with many sticks coming out of it, which might be a sun or a virus shape.

Sun Or Virus Shape

Bubbles

A magic wand, a baton or a two-colored stick with two sparkles.

A dripping, rainbow striped ice pop on a stick.

A power plant chimney or nuclear reactor with pollution smoke and a radioactive icon on it.

An opened mouth sticking out a rainbow striped tongue.

Two stacked books seen at an angle, the one at the bottom with a bookmark and the one on top with a round shape on its spine.

The words "them" and "they" in multicolored letters, contained in two stacked bubbles.

A factory facility with two chimneys emitting smoke or clouds.

A curved shape representing a cloud of smoke or steam. 

Four different-sized stacked books with curved spines.

A busy and overworked manager or employee surrounded by charts, graphs, and notifications.

A compact car with smke coming out of the back, representing pollution or gas emissions, facing side.