Portuguese 
English 
Spanish 
5 min of reading 
0 comments 
Study indicates that extreme heat and pollutants can affect human fertility and worsen difficulties in having children.
In 2026, researchers linked to Oregon State University, in the United States, published a review in the scientific journal npj Emerging Contaminants, on April 23, that raises a direct alert: exposure to synthetic chemical substances, including endocrine disruptors, microplastics, and PFAS, can add to the effects of climate change and increase risks to fertility and fecundity in humans, wild animals, and other biological groups.
The central point of the study, reported by The Guardian on April 26, is that extreme heat, hypoxia, chemical pollution, and compounds capable of interfering with hormones should not be treated as isolated threats. The analysis points out that these factors can act together, with additive or even synergistic effects, creating a more complex scenario for reproductive health and the survival of species in different ecosystems.
Study gathers scientific evidence and points out that multiple environmental factors can act together on fertility
The work conducted by the researchers analyzed about 177 scientific studies that investigated environmental impacts on reproduction in humans and animals. Instead of focusing on a single agent, the scientists evaluated how different factors accumulate in the body over time and can influence fertility.
-
Rains of almost 200 mm devastate Pernambuco and Paraíba in less than 24 hours, leaving six dead, 2,190 displaced, breaking 30-year rainfall records, and causing landslides that buried a mother and a six-month-old baby in Olinda, while almost 500 people needed to be rescued after being stranded by the floods.
-
A cold air mass gains strength, turns into a cold wave, and could drop temperatures in the South and Southeast for several days, with a peak between May 12 and 13, advancing close to the central region of Brazil, and a risk of storms before the weather change.
-
Scientists reveal a surprising phenomenon in which darkness surpasses the speed of light and challenges fundamental concepts of modern physics and the theory of relativity.
-
The most destructive storm that exists in nature has just been confirmed in Santa Catarina. A tornado ‘swept’ São Joaquim during the early hours, tearing off roofs, destroying crops, and leaving a trail of devastation that exposes the worst that the beginning of El Niño could have in store for Southern Brazil in the coming months.
This approach is important because the current environment does not expose people to just one isolated risk. Reality involves simultaneous contact with heat, pollutants, and environmental changes. Researchers draw attention precisely to this combined effect, which can amplify damage to the reproductive system, something that is still little explored in traditional studies.
Extreme heat interferes with hormonal function and can affect reproductive capacity
The increase in global temperatures appears as one of the main elements analyzed in the study. The human body has physiological limits to maintain the proper functioning of its systems, including the reproductive one.
When these limits are exceeded for prolonged periods of heat, hormonal changes and reduced efficiency of essential biological processes can occur.
Previous research has already shown that heat can impact sperm quality, alter the menstrual cycle, and interfere with ovulation. In regions where heatwaves are more frequent, variations in birth rates over time have also been observed. These data indicate that climate, by itself, already influences reproduction, even before considering other environmental factors.
Toxic substances present in daily life act as invisible hormonal disruptors
Parallel to heat, the study highlights the role of chemical substances that are part of daily life. Compounds such as microplastics, PFAS, bisphenol A, and phthalates are present in packaging, industrial products, household utensils, and even in the water consumed.
These substances are known as endocrine disruptors because they interfere with the hormonal system. They can mimic or block natural body hormones, altering fundamental processes linked to reproduction. The impact is silent and cumulative, which makes immediate perception of the effects difficult, but increases scientific concern in the long term.
Combination of heat and pollutants can intensify effects on the body
The main alert of the study lies in the interaction between these factors. Heat can increase the absorption of chemical substances by the body and alter how the body responds to them. At the same time, the presence of pollutants can make the body more vulnerable to thermal stress.
This relationship creates an amplification effect. What was once a moderate impact can become more significant when it occurs simultaneously with another environmental factor. Scientists point out that this type of interaction can generate stronger effects than each element in isolation, which changes the way fertility risks are interpreted.
Observed impacts go beyond humans and affect different species
The analysis is not limited to humans. Studies with animals and aquatic organisms show that combined effects also appear in other biological systems. Alterations in reproductive cycles, reduction in reproduction rates, and problems in embryo development were observed.
This broader scope reinforces the idea that it is an environmental phenomenon and not just an individual problem. When different species show similar responses, it indicates that there is a systemic factor at play, linked to the environment as a whole.
Fertility has been discussed for years in different studies around the world. Various factors have already been associated with this trend, including lifestyle changes, diet, pollution, and socioeconomic issues.
The new study does not claim that climate change and toxins are the sole cause, but suggests they may be a relevant part of the scenario. The combination of these factors adds a new layer of complexity to the debate, expanding the number of variables that need to be considered.
Scientists emphasize that more studies are still needed to measure direct impact on humans
Despite the warning, researchers highlight that there are still important gaps. Most of the analyzed studies evaluate isolated factors or use experimental models. The direct interaction between climate and pollutants still needs to be investigated in more depth in humans.
This means that the scenario presented is based on consistent evidence, but still under development. The alert is considered scientific and relevant, but it does not represent a definitive conclusion about direct global impact, which requires caution in interpretation.
Continuous exposure to multiple environmental factors becomes a growing challenge for reproductive health
What the study most clearly evidences is the change in the type of risk currently faced. Fertility is no longer associated only with individual or isolated factors, but with a set of environmental conditions that act simultaneously.
This continuous exposure can make it difficult to identify specific causes and make the impacts harder to reverse. The sum of small factors can generate a significant effect over time, especially when it involves sensitive processes like reproduction.
Now the direct question remains: if the environment around us is becoming an increasingly determining factor for fertility, to what extent can changes in climate and exposure to chemical substances alter the ability of future generations to have children?
Be the first to react!