Several researchers and theorists believe that the resources provided by the natural environment are decreasing and measures need to take place to counter the constant increase in population. Julian Lincoln Simon is against this notion and believes that resources are not becoming scarce and are being generated in abundance (Simon 578) . She believes that the increase in prices of resources provides individuals such as farmers and manufacturers to produce more and to create new discoveries and participate in the act of recycling which results in the creation of substitute goods. This means that resources are not becoming scarce. instead they are being replaced with substitutes which counter the issue of shortage created due to increase in population.
Researchers such as Ben Wattenberg state that population growth has negatively impacted the environment but now the growth rate is declining and will eventually come to an end (Wattenberg, 2012). Due to this he believes that the problem of shortage of environmental resources will be countered and there will be enough resources for human beings. According to him the population growth of certain developed nations such as Europe has come to a stand still and the population growth of areas such as Asian nations have declined drastically. In response to Wattenberg, Kenneth Hill states that although population growth rate has declined, still the boom in population is not over and will continue to rise (Slate Magazine, 2012). Hill points out various issues in calculating the population rate and points out that several people are not even counted among the population of a nation. Hill sates that problems such as increase in rate of immigration and decrease in the rate of infant mortality and increase in the number of old aged people is an alarming point for US.