Complete the sentences with the words from the box in the correct form.

1) I find the problem of water worrying. 2) I find the problem of climate change to be very concerning. 3) I am worried about the temperature to be very high. 4) I am concerned about animals in danger. 5) Many people in the world find the destruction of the rainforest very worrying. 6) They worry because there may be health problems when litter is left in the streets.