The sentence "environmental obstacles" is correct and usable in written English.
You can use it to refer to difficulties or challenges in a specific environment or to obstacles which have an environmental cause or effect. For example: "The company is facing significant environmental obstacles in its attempts to reduce its carbon footprint."
The environmental obstacles are huge.
Efforts to dig mines elsewhere face many legal and environmental obstacles.
The engines must be much more complex, and the sonic boom and engine roar raise serious environmental obstacles.
These are turbulent times for horse owners throughout New Jersey who are facing ever-tougher economic and environmental obstacles.
Mr. Renzi disagrees, arguing that district residents are more concerned about environmental obstacles to economic development and bureaucratic mandates imposed on small businesses than about falling stock prices.
The crisis that came has nothing to do with prices at the gas pump, or environmental obstacles to drilling in the Arctic National Wildlife Refuge in Alaska.
To the extent that urban transportation is considered at all in the context of sustainability, it is typically identified with motorized private transport and is therefore seen as an environmental obstacle, rather than more broadly in terms of land use and alternative travel modes and hence as an economic development opportunity.
And "A pressure is an environmental obstacle that may cause evolution in a particular direction".
The peddler's and pedestrian's routes appear purposive, and by overcoming an environmental obstacle (the bookworm), they show themselves to be in control of their surroundings.
Crustose lichens have indeterminate growth, i.e. they grow until they meet other lichens or some other kind of environmental obstacle.
That is, the increased turning angle with narrow gaps and with the plate attached resulted from assessment of the nature of the environmental obstacle and embodiment of the shell extension.
