first one
the dangers that plants face are quite many,such as,soil erosion,wanton felling of trees,greenhouse effect,acid rain and other kinds of environmental pollution.
second one
plants are not human beings,they can't protect themselves.the only way they can survive is under the protection of mankinds.each one should enhance the consciousness of environmental protection.it is also important to strenghten the special education of next generation.they are the future of the world.