Pollination of our food sources by bees is necessary for our continued existence since, without them, we would starve. Pollination is essential to the survival of plants and trees, which in turn makes us and the other species on Earth dependent on those plants. The unfortunate reality is that over the course of the past few decades, there have been disturbing signals that the worldwide bee numbers are diminishing, and this does not bode well for our future. Bees are essential to our ecosystem because they pollinate flowers, produce honey, and control pests. Discover additional information for children about bees.