But some species, including Lebanon's national symbol, the mighty cedar tree, are already straining at their upper limits. Cedars, some up to 3,000 years old, form the highest treeline.

The Lebanon cedar, a distinct species known scientifically as Cedrus libani, grows mainly here and in Turkey. The trees germinate in late winter because they need a freeze, preferably with snow.

The Lebanon cedar, a distinct species known scientifically as Cedrus libani, grows mainly here and in Turkey. The trees germinate in late winter because they need a freeze, preferably with snow.

The Lebanon cedar, a distinct species known scientifically as Cedrus libani, grows mainly here and in Turkey. The trees germinate in late winter because they need a freeze, preferably with snow.