One significant challenge that Japan faces today is the scarcity of natural resources. Japan is heavily reliant on imports for its energy and raw materials, which can impact its economic stability and energy security. Additionally, the country must navigate issues related to energy production, especially following the Fukushima nuclear disaster in 2011, which raised concerns about nuclear energy reliance.
Other challenges include an aging population and declining birth rates, which contribute to a shrinking workforce and economic pressures. However, from the options provided, the scarcity of natural resources is a direct and pressing concern.