But renewable energy cost declines have been consistently underestimated, while policy uncertainty and siting difficulties changed in unforeseen ways between the Bush and Obama administrations, making predicting the future harder than ever for utilities.
Furthermore, as the sole of the feet and the heel were other predilection sites, difficulty in walking was also very common.
The study of cancer in humans is impeded by several reasons, such as inaccessibility to the tumor sites, difficulty in the assessment of tumor biology, and ethical concerns.
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Issues covered in interviews with providers included personal history and experience in counseling and testing, practices and management of testing in their own HIVCT site, difficulties and achievements regarding quality of care and ethics, comparison between campaign settings and routine practice, and suggestions for improvement of HIVCT services.
The study finds shifting state policies, evolving customer demand, and difficulty siting coal generation forced dramatic differences between the resources Western U.S. utilities envisioned in their Integrated Resource Plans (IRPs) and the resources they actually procured.
The difficulty of siting new plants has made old plants less likely to be replaced, and dramatic technological advances have reduced maintenance costs and made it possible to extend the life of old plants.
Then there is the difficulty of siting lines and allocating transmission costs.
These problems -- error messages, site timeouts, difficulty logging in to an account -- make it hard for an individual to buy coverage through the marketplace.
A site-specific difficulty is the substantial rates of gas ebullition from anaerobic organic matter biodegradation in the sediments, particularly in the summer months.
