The IUCN Red list of threatened species shows this dragonfly as of least concern for extinction–one of the lucky ones. However, according to Wikipedia:
The decline [in many insects] has been attributed to habitat destruction caused by intensive farming and urbanisation, pesticide use, introduced species, climate change, and artificial lighting. The use of increased quantities of insecticides and herbicides on crops have affected not only non-target insect species, but also the plants on which they feed. Climate change and the introduction of exotic species that compete with the indigenous ones put the native species under stress, and as a result they are more likely to succumb to pathogens and parasites. While some species such as flies and cockroaches might increase as a result, the total biomass of insects is estimated to be decreasing by about 2.5% per year.
To see more recent insect photos, see Insectorama.