The environment includes the natural and artificial (technogenic) environment, that is, totality of environmental elements created from substances. article provides a theoretical analysis concept green economy, approaches to its understanding, conditions for implementation, as well significance enterprises. As result study, it is shown instability development trends have developed in world mode...

For all positive integers $r\geq 3$ and $n$ such that $r^2-r$ divides an affine plane of order $r$ exists, we construct $r$-edge colored graph with minimum degree $(1-\frac{r-2}{r^2-r})n-2$ the largest monochromatic component has less than $\frac{n}{r-1}$. This generalizes example Guggiari Scott and, independently, Rahimi for $r=3$ thus disproves a conjecture Gyarfas Sarkozy exists.