I believe that when the human race was first created we started off with Red Blood Cells in our bodies. Over the years as we evolved so did the food we eat, our means of transportation and everything else around us. Not only did we create more waste in the environment but we dirtied our drinking water and air. Which means the food we grow is dirty since they need water to survive.
Because of this over a long stretch of years we began to develop alot of respiratory illnesses, food born illnesses and illnesses from the bacterias that surrounds us.
Think about it, if everything evolves then its possible that so was our Blood Cells.
Our bodies has always strive to adapted to its surroundings and so did everything else around us. So is it possible that our bodies created White Blood Cells to help us adapt to the toxic waste and illnesses we are constantly putting out into the world.
Can this be the reason why, the more White Blood Cells one has, the stronger their bodies has to fight against something bad and the closer they are to dying.
So what if we wanted to cure all sickness, then can we use the body and its cells to point us to the rite direction. The human body might be the answer not only to save us but the plant and animal kingdom also. Maybe the less white blood cells we have as a whole unit can fortell the healthiness of the environment. Which makes sense because at the moment as a unit we have more sickness, waste and bacteria than before. And it is way much easier to get sick now than a long time ago.
So to know if we are properly cleaning and fixing the earth up, we can judge by our body white count level as a whole unit. This can only be fix in the longterm since it is impossible to do it in the short term being how unhealthy the earth is and having to reset our DNA. Which means we are further away from the day of saving the planet than we are to the day of fixing it.